{"id":373,"date":"2024-09-22T11:26:28","date_gmt":"2024-09-22T04:26:28","guid":{"rendered":"https:\/\/gotutorial.org\/?page_id=373"},"modified":"2024-09-22T11:40:04","modified_gmt":"2024-09-22T04:40:04","slug":"go-select","status":"publish","type":"page","link":"https:\/\/www.gotutorial.org\/go-tutorial\/go-select\/","title":{"rendered":"Go Select"},"content":{"rendered":"\n<p><strong>Summary<\/strong>: in this tutorial, you will learn how to use the select statement to manage multiple channel operations.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Introduction to the Go select statement<\/h2>\n\n\n\n<p><a href=\"https:\/\/gotutorial.org\/go-tutorial\/goroutines\/\">Goroutines<\/a> communicate with each other via <a href=\"https:\/\/gotutorial.org\/go-tutorial\/go-channels\/\">channels<\/a>. They share data via communication.<\/p>\n\n\n\n<p>In Go, the <code>select<\/code> statement allows a goroutine to wait on multiple channels, proceeding with the first available channel. The <code>select<\/code> statement works like a <a href=\"https:\/\/gotutorial.org\/go-tutorial\/go-switch\/\">switch statement<\/a> but for channels.<\/p>\n\n\n\n<p>Here&#8217;s the basic syntax of the <code>select<\/code> statement:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-1\" data-shcb-language-name=\"Go\" data-shcb-language-slug=\"go\"><span><code class=\"hljs language-go\"><span class=\"hljs-keyword\">select<\/span> {\n<span class=\"hljs-keyword\">case<\/span> &lt;-channel1:\n    <span class=\"hljs-comment\">\/\/ Code to execute when channel1 receives data<\/span>\n<span class=\"hljs-keyword\">case<\/span> data := &lt;-channel2:\n    <span class=\"hljs-comment\">\/\/ Code to execute when channel2 receives data<\/span>\n<span class=\"hljs-keyword\">default<\/span>:\n    <span class=\"hljs-comment\">\/\/ Code to execute if none of the above channels are ready<\/span>\n}<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-1\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">Go<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">go<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>In this syntax: <\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Each <code>case<\/code> statement listens to a channel.<\/li>\n\n\n\n<li>The <code>select<\/code> statement <em>waits <\/em>until a channel (<code>channel1<\/code> or <code>channel2<\/code>) receives data and proceeds to the corresponding <code>case<\/code>. It will choose a random <code>case<\/code> to proceed if multiple channels are ready at the same time.<\/li>\n\n\n\n<li>If none of the channels are ready, the <code>switch<\/code> statement will execute the <code>default<\/code> branch.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">A basic Go select statement example<\/h2>\n\n\n\n<p>The following example illustrates how the <code>select<\/code> statement works:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-2\" data-shcb-language-name=\"Go\" data-shcb-language-slug=\"go\"><span><code class=\"hljs language-go\"><span class=\"hljs-keyword\">package<\/span> main\n\n<span class=\"hljs-keyword\">import<\/span> (\n    <span class=\"hljs-string\">\"fmt\"<\/span>\n    <span class=\"hljs-string\">\"time\"<\/span>\n)\n\n<span class=\"hljs-function\"><span class=\"hljs-keyword\">func<\/span> <span class=\"hljs-title\">main<\/span><span class=\"hljs-params\">()<\/span><\/span> {\n    fmt.Println(<span class=\"hljs-string\">\"The program started...\"<\/span>)\n\n    ch1 := <span class=\"hljs-built_in\">make<\/span>(<span class=\"hljs-keyword\">chan<\/span> <span class=\"hljs-keyword\">string<\/span>)\n    ch2 := <span class=\"hljs-built_in\">make<\/span>(<span class=\"hljs-keyword\">chan<\/span> <span class=\"hljs-keyword\">string<\/span>)\n\n    <span class=\"hljs-keyword\">go<\/span> <span class=\"hljs-function\"><span class=\"hljs-keyword\">func<\/span><span class=\"hljs-params\">()<\/span><\/span> {\n        time.Sleep(<span class=\"hljs-number\">2<\/span> * time.Second)\n        ch1 &lt;- <span class=\"hljs-string\">\"Message from channel 1\"<\/span>\n    }()\n\n    <span class=\"hljs-keyword\">go<\/span> <span class=\"hljs-function\"><span class=\"hljs-keyword\">func<\/span><span class=\"hljs-params\">()<\/span><\/span> {\n        time.Sleep(<span class=\"hljs-number\">1<\/span> * time.Second)\n        ch2 &lt;- <span class=\"hljs-string\">\"Message from channel 2\"<\/span>\n    }()\n\n    <span class=\"hljs-keyword\">select<\/span> {\n    <span class=\"hljs-keyword\">case<\/span> msg1 := &lt;-ch1:\n        fmt.Println(msg1)\n    <span class=\"hljs-keyword\">case<\/span> msg2 := &lt;-ch2:\n        fmt.Println(msg2)\n    }\n}<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-2\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">Go<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">go<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Output:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-3\" data-shcb-language-name=\"Go\" data-shcb-language-slug=\"go\"><span><code class=\"hljs language-go\">The program started...\nMessage from ch2<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-3\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">Go<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">go<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>How it works.<\/p>\n\n\n\n<p>First, create two channels with the type <code>string<\/code>:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-4\" data-shcb-language-name=\"Go\" data-shcb-language-slug=\"go\"><span><code class=\"hljs language-go\">ch1 := <span class=\"hljs-built_in\">make<\/span>(<span class=\"hljs-keyword\">chan<\/span> <span class=\"hljs-keyword\">string<\/span>)\nch2 := <span class=\"hljs-built_in\">make<\/span>(<span class=\"hljs-keyword\">chan<\/span> <span class=\"hljs-keyword\">string<\/span>)<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-4\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">Go<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">go<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Second, spawn a goroutine that delays 2 seconds before sending the message <code>\"Message from channel 1\"<\/code> to channel 1 (<code>ch1<\/code>):<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-5\" data-shcb-language-name=\"Go\" data-shcb-language-slug=\"go\"><span><code class=\"hljs language-go\"><span class=\"hljs-keyword\">go<\/span> <span class=\"hljs-function\"><span class=\"hljs-keyword\">func<\/span><span class=\"hljs-params\">()<\/span><\/span> {\n    time.Sleep(<span class=\"hljs-number\">2<\/span> * time.Second)\n    ch1 &lt;- <span class=\"hljs-string\">\"Message from channel 1\"<\/span>\n}()<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-5\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">Go<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">go<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Third, spawn a second goroutine that takes 1 second before sending the message <code>\"Message from channel 2\"<\/code> to channel 2 (<code>ch2<\/code>):<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-6\" data-shcb-language-name=\"Go\" data-shcb-language-slug=\"go\"><span><code class=\"hljs language-go\"><span class=\"hljs-keyword\">go<\/span> <span class=\"hljs-function\"><span class=\"hljs-keyword\">func<\/span><span class=\"hljs-params\">()<\/span><\/span> {\n    time.Sleep(<span class=\"hljs-number\">1<\/span> * time.Second)\n    ch2 &lt;- <span class=\"hljs-string\">\"Message from channel 2\"<\/span>\n}()<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-6\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">Go<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">go<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Finally, use the <code>select<\/code> statement to wait for the first available channel and display the received message:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-7\" data-shcb-language-name=\"Go\" data-shcb-language-slug=\"go\"><span><code class=\"hljs language-go\"><span class=\"hljs-keyword\">select<\/span> {\n<span class=\"hljs-keyword\">case<\/span> msg1 := &lt;-ch1:\n    fmt.Println(msg1)\n<span class=\"hljs-keyword\">case<\/span> msg2 := &lt;-ch2:\n    fmt.Println(msg2)\n}<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-7\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">Go<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">go<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>The second goroutine sends data to the ch2 channel before the first goroutine sends data to the ch1 channel. <\/p>\n\n\n\n<p>Therefore, the channel <code>ch2<\/code> is ready first, which executes the second <code>case<\/code> in the <code>switch<\/code> statement.<\/p>\n\n\n\n<p>After executing the second <code>case<\/code>, the <code>switch<\/code> statement exists. Meanwhile, the first goroutine is running until the main goroutine ends.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">A practical Go select statement example<\/h2>\n\n\n\n<p>The following example shows how to download two files from a remote server concurrently and store the one that is first available:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-8\" data-shcb-language-name=\"Go\" data-shcb-language-slug=\"go\"><span><code class=\"hljs language-go\"><span class=\"hljs-keyword\">package<\/span> main\n\n<span class=\"hljs-keyword\">import<\/span> (\n    <span class=\"hljs-string\">\"fmt\"<\/span>\n    <span class=\"hljs-string\">\"io\"<\/span>\n    <span class=\"hljs-string\">\"net\/http\"<\/span>\n    <span class=\"hljs-string\">\"os\"<\/span>\n)\n\n<span class=\"hljs-keyword\">type<\/span> Response <span class=\"hljs-keyword\">struct<\/span> {\n    data &#91;]<span class=\"hljs-keyword\">byte<\/span>\n    err  error\n}\n\n<span class=\"hljs-function\"><span class=\"hljs-keyword\">func<\/span> <span class=\"hljs-title\">fetch<\/span><span class=\"hljs-params\">(url <span class=\"hljs-keyword\">string<\/span>, ch <span class=\"hljs-keyword\">chan<\/span> Response)<\/span><\/span> {\n    resp, err := http.Get(url)\n    <span class=\"hljs-keyword\">if<\/span> err != <span class=\"hljs-literal\">nil<\/span> {\n        ch &lt;- Response{data: <span class=\"hljs-literal\">nil<\/span>, err: err}\n        <span class=\"hljs-keyword\">return<\/span>\n    }\n\n    <span class=\"hljs-keyword\">defer<\/span> resp.Body.Close()\n\n    bs, _ := io.ReadAll(resp.Body)\n    ch &lt;- Response{data: bs, err: <span class=\"hljs-literal\">nil<\/span>}\n}\n\n<span class=\"hljs-function\"><span class=\"hljs-keyword\">func<\/span> <span class=\"hljs-title\">save<\/span><span class=\"hljs-params\">(filepath <span class=\"hljs-keyword\">string<\/span>, data &#91;]<span class=\"hljs-keyword\">byte<\/span>)<\/span> <span class=\"hljs-title\">error<\/span><\/span> {\n    out, err := os.Create(filepath)\n    <span class=\"hljs-keyword\">if<\/span> err != <span class=\"hljs-literal\">nil<\/span> {\n        <span class=\"hljs-keyword\">return<\/span> fmt.Errorf(<span class=\"hljs-string\">\"failed to create file: %v\"<\/span>, err)\n    }\n    <span class=\"hljs-keyword\">defer<\/span> out.Close()\n\n    _, err = out.Write(data)\n    <span class=\"hljs-keyword\">if<\/span> err != <span class=\"hljs-literal\">nil<\/span> {\n        <span class=\"hljs-keyword\">return<\/span> fmt.Errorf(<span class=\"hljs-string\">\"failed to close file: %v\"<\/span>, err)\n    }\n    <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-literal\">nil<\/span>\n}\n\n<span class=\"hljs-function\"><span class=\"hljs-keyword\">func<\/span> <span class=\"hljs-title\">process<\/span><span class=\"hljs-params\">(resp Response, filepath <span class=\"hljs-keyword\">string<\/span>)<\/span><\/span> {\n    <span class=\"hljs-keyword\">if<\/span> resp.err != <span class=\"hljs-literal\">nil<\/span> {\n        fmt.Println(<span class=\"hljs-string\">\"Error:\"<\/span>, resp.err)\n        <span class=\"hljs-keyword\">return<\/span>\n    }\n    err := save(filepath, resp.data)\n    <span class=\"hljs-keyword\">if<\/span> err != <span class=\"hljs-literal\">nil<\/span> {\n        fmt.Println(<span class=\"hljs-string\">\"Error:\"<\/span>, err)\n        <span class=\"hljs-keyword\">return<\/span>\n    }\n}\n\n<span class=\"hljs-function\"><span class=\"hljs-keyword\">func<\/span> <span class=\"hljs-title\">main<\/span><span class=\"hljs-params\">()<\/span><\/span> {\n    urls := &#91;]<span class=\"hljs-keyword\">string<\/span>{\n        <span class=\"hljs-string\">\"https:\/\/www.rfc-editor.org\/rfc\/rfc1543.txt\"<\/span>,\n        <span class=\"hljs-string\">\"https:\/\/www.rfc-editor.org\/rfc\/rfc1541.txt\"<\/span>,\n    }\n\n    ch1 := <span class=\"hljs-built_in\">make<\/span>(<span class=\"hljs-keyword\">chan<\/span> Response)\n    ch2 := <span class=\"hljs-built_in\">make<\/span>(<span class=\"hljs-keyword\">chan<\/span> Response)\n\n    <span class=\"hljs-keyword\">go<\/span> fetch(urls&#91;<span class=\"hljs-number\">0<\/span>], ch1)\n    <span class=\"hljs-keyword\">go<\/span> fetch(urls&#91;<span class=\"hljs-number\">1<\/span>], ch2)\n\n    <span class=\"hljs-keyword\">select<\/span> {\n    <span class=\"hljs-keyword\">case<\/span> resp := &lt;-ch1:\n        process(resp, <span class=\"hljs-string\">\"rfc1543.txt\"<\/span>)\n    <span class=\"hljs-keyword\">case<\/span> resp := &lt;-ch2:\n        process(resp, <span class=\"hljs-string\">\"rfc1541.txt\"<\/span>)\n    }\n}<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-8\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">Go<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">go<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>How it works.<\/p>\n\n\n\n<p>Step 1. Define a <code>Response<\/code> struct that includes two fields <code>data<\/code> and <code>err<\/code>.<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-9\" data-shcb-language-name=\"Go\" data-shcb-language-slug=\"go\"><span><code class=\"hljs language-go\"><span class=\"hljs-keyword\">type<\/span> Response <span class=\"hljs-keyword\">struct<\/span> {\n    data &#91;]<span class=\"hljs-keyword\">byte<\/span>\n    err  error\n}<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-9\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">Go<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">go<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Step 2. Define a <code>fetch()<\/code> function that downloads data from a URL and sends the data to a channel with the type of <code>Response<\/code>:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-10\" data-shcb-language-name=\"Go\" data-shcb-language-slug=\"go\"><span><code class=\"hljs language-go\"><span class=\"hljs-function\"><span class=\"hljs-keyword\">func<\/span> <span class=\"hljs-title\">fetch<\/span><span class=\"hljs-params\">(url <span class=\"hljs-keyword\">string<\/span>, ch <span class=\"hljs-keyword\">chan<\/span> Response)<\/span><\/span> {\n    resp, err := http.Get(url)\n    <span class=\"hljs-keyword\">if<\/span> err != <span class=\"hljs-literal\">nil<\/span> {\n        ch &lt;- Response{data: <span class=\"hljs-literal\">nil<\/span>, err: err}\n        <span class=\"hljs-keyword\">return<\/span>\n    }\n\n    <span class=\"hljs-keyword\">defer<\/span> resp.Body.Close()\n\n    bs, _ := io.ReadAll(resp.Body)\n    ch &lt;- Response{data: bs, err: <span class=\"hljs-literal\">nil<\/span>}\n}<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-10\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">Go<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">go<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Step 3. Define the <code>save()<\/code> function that saves the downloaded data into a file:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-11\" data-shcb-language-name=\"Go\" data-shcb-language-slug=\"go\"><span><code class=\"hljs language-go\"><span class=\"hljs-function\"><span class=\"hljs-keyword\">func<\/span> <span class=\"hljs-title\">save<\/span><span class=\"hljs-params\">(filepath <span class=\"hljs-keyword\">string<\/span>, data &#91;]<span class=\"hljs-keyword\">byte<\/span>)<\/span> <span class=\"hljs-title\">error<\/span><\/span> {\n    out, err := os.Create(filepath)\n    <span class=\"hljs-keyword\">if<\/span> err != <span class=\"hljs-literal\">nil<\/span> {\n        <span class=\"hljs-keyword\">return<\/span> fmt.Errorf(<span class=\"hljs-string\">\"failed to create file: %v\"<\/span>, err)\n    }\n    <span class=\"hljs-keyword\">defer<\/span> out.Close()\n\n    _, err = out.Write(data)\n    <span class=\"hljs-keyword\">if<\/span> err != <span class=\"hljs-literal\">nil<\/span> {\n        <span class=\"hljs-keyword\">return<\/span> fmt.Errorf(<span class=\"hljs-string\">\"failed to close file: %v\"<\/span>, err)\n    }\n    <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-literal\">nil<\/span>\n}<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-11\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">Go<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">go<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Step 4. Define the <code>process()<\/code> function that processes the <code>Response<\/code> and saves the <code>data<\/code> field from it to a file:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-12\" data-shcb-language-name=\"Go\" data-shcb-language-slug=\"go\"><span><code class=\"hljs language-go\"><span class=\"hljs-function\"><span class=\"hljs-keyword\">func<\/span> <span class=\"hljs-title\">process<\/span><span class=\"hljs-params\">(resp Response, filepath <span class=\"hljs-keyword\">string<\/span>)<\/span><\/span> {\n    <span class=\"hljs-keyword\">if<\/span> resp.err != <span class=\"hljs-literal\">nil<\/span> {\n        fmt.Println(<span class=\"hljs-string\">\"Error:\"<\/span>, resp.err)\n        <span class=\"hljs-keyword\">return<\/span>\n    }\n    err := save(filepath, resp.data)\n    <span class=\"hljs-keyword\">if<\/span> err != <span class=\"hljs-literal\">nil<\/span> {\n        fmt.Println(<span class=\"hljs-string\">\"Error:\"<\/span>, err)\n        <span class=\"hljs-keyword\">return<\/span>\n    }\n}<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-12\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">Go<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">go<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Step 5. Define the <code>main<\/code> function:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-13\" data-shcb-language-name=\"Go\" data-shcb-language-slug=\"go\"><span><code class=\"hljs language-go\"><span class=\"hljs-function\"><span class=\"hljs-keyword\">func<\/span> <span class=\"hljs-title\">main<\/span><span class=\"hljs-params\">()<\/span><\/span> {\n    urls := &#91;]<span class=\"hljs-keyword\">string<\/span>{\n        <span class=\"hljs-string\">\"https:\/\/www.rfc-editor.org\/rfc\/rfc1543.txt\"<\/span>,\n        <span class=\"hljs-string\">\"https:\/\/www.rfc-editor.org\/rfc\/rfc1541.txt\"<\/span>,\n    }\n\n    ch1 := <span class=\"hljs-built_in\">make<\/span>(<span class=\"hljs-keyword\">chan<\/span> Response)\n    ch2 := <span class=\"hljs-built_in\">make<\/span>(<span class=\"hljs-keyword\">chan<\/span> Response)\n\n    <span class=\"hljs-keyword\">go<\/span> fetch(urls&#91;<span class=\"hljs-number\">0<\/span>], ch1)\n    <span class=\"hljs-keyword\">go<\/span> fetch(urls&#91;<span class=\"hljs-number\">1<\/span>], ch2)\n\n    <span class=\"hljs-keyword\">select<\/span> {\n    <span class=\"hljs-keyword\">case<\/span> resp := &lt;-ch1:\n        process(resp, <span class=\"hljs-string\">\"rfc1543.txt\"<\/span>)\n    <span class=\"hljs-keyword\">case<\/span> resp := &lt;-ch2:\n        process(resp, <span class=\"hljs-string\">\"rfc1541.txt\"<\/span>)\n    }\n}<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-13\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">Go<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">go<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>How it works.<\/p>\n\n\n\n<p>First, initialize a slice of URLs to download:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-14\" data-shcb-language-name=\"Go\" data-shcb-language-slug=\"go\"><span><code class=\"hljs language-go\">urls := &#91;]<span class=\"hljs-keyword\">string<\/span>{\n    <span class=\"hljs-string\">\"https:\/\/www.rfc-editor.org\/rfc\/rfc1543.txt\"<\/span>,\n    <span class=\"hljs-string\">\"https:\/\/www.rfc-editor.org\/rfc\/rfc1541.txt\"<\/span>,\n}<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-14\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">Go<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">go<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Second, create two channels with the type <code>Response<\/code>:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-15\" data-shcb-language-name=\"Go\" data-shcb-language-slug=\"go\"><span><code class=\"hljs language-go\">ch1 := <span class=\"hljs-built_in\">make<\/span>(<span class=\"hljs-keyword\">chan<\/span> Response)\nch2 := <span class=\"hljs-built_in\">make<\/span>(<span class=\"hljs-keyword\">chan<\/span> Response)<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-15\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">Go<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">go<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Third, spawn two goroutines to download data from each URL in the <code>urls<\/code> slice and send that data to the corresponding channel:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-16\" data-shcb-language-name=\"Go\" data-shcb-language-slug=\"go\"><span><code class=\"hljs language-go\"><span class=\"hljs-keyword\">go<\/span> fetch(urls&#91;<span class=\"hljs-number\">0<\/span>], ch1)\n<span class=\"hljs-keyword\">go<\/span> fetch(urls&#91;<span class=\"hljs-number\">1<\/span>], ch2)<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-16\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">Go<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">go<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Finally, use the <code>select<\/code> statement to wait for the response from either channel <code>ch1<\/code> or <code>ch2<\/code>:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-17\" data-shcb-language-name=\"Go\" data-shcb-language-slug=\"go\"><span><code class=\"hljs language-go\"><span class=\"hljs-keyword\">select<\/span> {\n<span class=\"hljs-keyword\">case<\/span> resp := &lt;-ch1:\n    process(resp, <span class=\"hljs-string\">\"rfc1543.txt\"<\/span>)\n<span class=\"hljs-keyword\">case<\/span> resp := &lt;-ch2:\n    process(resp, <span class=\"hljs-string\">\"rfc1541.txt\"<\/span>)\n}<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-17\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">Go<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">go<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Once a channel receives data, the <code>process()<\/code> function will execute which calls the <code>save()<\/code> function to save data to a file.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Timeout <\/h2>\n\n\n\n<p>The following program illustrates how to timeout an operation if it takes more than 2 seconds to complete:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-18\" data-shcb-language-name=\"Go\" data-shcb-language-slug=\"go\"><span><code class=\"hljs language-go\"><span class=\"hljs-keyword\">package<\/span> main\n\n<span class=\"hljs-keyword\">import<\/span> (\n    <span class=\"hljs-string\">\"fmt\"<\/span>\n    <span class=\"hljs-string\">\"time\"<\/span>\n)\n\n<span class=\"hljs-function\"><span class=\"hljs-keyword\">func<\/span> <span class=\"hljs-title\">main<\/span><span class=\"hljs-params\">()<\/span><\/span> {\n    ch := <span class=\"hljs-built_in\">make<\/span>(<span class=\"hljs-keyword\">chan<\/span> <span class=\"hljs-keyword\">string<\/span>)\n\n    <span class=\"hljs-keyword\">go<\/span> <span class=\"hljs-function\"><span class=\"hljs-keyword\">func<\/span><span class=\"hljs-params\">()<\/span><\/span> {\n        time.Sleep(<span class=\"hljs-number\">3<\/span> * time.Second)\n        ch &lt;- <span class=\"hljs-string\">\"Operation completed\"<\/span>\n    }()\n\n    <span class=\"hljs-keyword\">select<\/span> {\n    <span class=\"hljs-keyword\">case<\/span> msg := &lt;-ch:\n        fmt.Println(msg)\n    <span class=\"hljs-keyword\">case<\/span> &lt;-time.After(<span class=\"hljs-number\">2<\/span> * time.Second):\n        fmt.Println(<span class=\"hljs-string\">\"The operation took too long.\"<\/span>)\n    }\n}<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-18\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">Go<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">go<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Output:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-19\" data-shcb-language-name=\"Go\" data-shcb-language-slug=\"go\"><span><code class=\"hljs language-go\">The operation took too long.<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-19\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">Go<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">go<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>How it works.<\/p>\n\n\n\n<p>First, create a new channel:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-20\" data-shcb-language-name=\"Go\" data-shcb-language-slug=\"go\"><span><code class=\"hljs language-go\">ch := <span class=\"hljs-built_in\">make<\/span>(<span class=\"hljs-keyword\">chan<\/span> <span class=\"hljs-keyword\">string<\/span>)<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-20\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">Go<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">go<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Second, spawn a new goroutine that takes 3 seconds before sending a message to the channel:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-21\" data-shcb-language-name=\"Go\" data-shcb-language-slug=\"go\"><span><code class=\"hljs language-go\"><span class=\"hljs-keyword\">go<\/span> <span class=\"hljs-function\"><span class=\"hljs-keyword\">func<\/span><span class=\"hljs-params\">()<\/span><\/span> {\n    time.Sleep(<span class=\"hljs-number\">3<\/span> * time.Second)\n    ch &lt;- <span class=\"hljs-string\">\"Operation completed\"<\/span>\n}()<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-21\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">Go<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">go<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Third, use the <code>select<\/code> statement to wait for channels:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-22\" data-shcb-language-name=\"Go\" data-shcb-language-slug=\"go\"><span><code class=\"hljs language-go\"><span class=\"hljs-keyword\">select<\/span> {\n<span class=\"hljs-keyword\">case<\/span> msg := &lt;-ch:\n    fmt.Println(msg)\n<span class=\"hljs-keyword\">case<\/span> &lt;-time.After(<span class=\"hljs-number\">2<\/span> * time.Second):\n    fmt.Println(<span class=\"hljs-string\">\"The operation took too long.\"<\/span>)\n}<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-22\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">Go<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">go<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>The <code>time.After(2 * time.Second)<\/code> creates a channel that sends the current time after 2 seconds.<\/p>\n\n\n\n<p>Since it takes 3 seconds for the data to be available on channel <code>ch<\/code>, the second case executes and displays the message <code>\"The operation took too long.\"<\/code>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Using for with select statement<\/h2>\n\n\n\n<p>The <code>select<\/code> statement processes the first available channel and exits. To process data from multiple channels with various logic, you can use a <a href=\"https:\/\/gotutorial.org\/go-tutorial\/go-for-loop\/\">for loop<\/a>:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-23\" data-shcb-language-name=\"Go\" data-shcb-language-slug=\"go\"><span><code class=\"hljs language-go\"><span class=\"hljs-keyword\">for<\/span> {\n    <span class=\"hljs-keyword\">select<\/span> {\n    <span class=\"hljs-keyword\">case<\/span> msg1 := &lt;-channel1:\n        <span class=\"hljs-comment\">\/\/ Code to execute when channel1 receives data<\/span>\n    <span class=\"hljs-keyword\">case<\/span> msg2 := &lt;-channel2:\n        <span class=\"hljs-comment\">\/\/ Code to execute when channel2 receives data<\/span>\n    <span class=\"hljs-keyword\">default<\/span>:\n        <span class=\"hljs-comment\">\/\/ Code to execute if none of the above channels are ready<\/span>\n    }\n}<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-23\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">Go<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">go<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>How it works.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>First, use the <code>for<\/code> statement to create an indefinite loop.<\/li>\n\n\n\n<li>Second, use the <code>select<\/code> statement to wait for data from multiple channels and process data from channels in sequence.<\/li>\n<\/ul>\n\n\n\n<p>For example:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-24\" data-shcb-language-name=\"Go\" data-shcb-language-slug=\"go\"><span><code class=\"hljs language-go\"><span class=\"hljs-keyword\">package<\/span> main\n\n<span class=\"hljs-keyword\">import<\/span> (\n    <span class=\"hljs-string\">\"fmt\"<\/span>\n    <span class=\"hljs-string\">\"time\"<\/span>\n)\n\n<span class=\"hljs-function\"><span class=\"hljs-keyword\">func<\/span> <span class=\"hljs-title\">main<\/span><span class=\"hljs-params\">()<\/span><\/span> {\n    ch1 := <span class=\"hljs-built_in\">make<\/span>(<span class=\"hljs-keyword\">chan<\/span> <span class=\"hljs-keyword\">string<\/span>)\n    ch2 := <span class=\"hljs-built_in\">make<\/span>(<span class=\"hljs-keyword\">chan<\/span> <span class=\"hljs-keyword\">string<\/span>)\n\n    <span class=\"hljs-keyword\">go<\/span> <span class=\"hljs-function\"><span class=\"hljs-keyword\">func<\/span><span class=\"hljs-params\">()<\/span><\/span> {\n        time.Sleep(<span class=\"hljs-number\">1<\/span> * time.Second)\n        ch1 &lt;- <span class=\"hljs-string\">\"Message from channel 1\"<\/span>\n    }()\n\n    <span class=\"hljs-keyword\">go<\/span> <span class=\"hljs-function\"><span class=\"hljs-keyword\">func<\/span><span class=\"hljs-params\">()<\/span><\/span> {\n        time.Sleep(<span class=\"hljs-number\">2<\/span> * time.Second)\n        ch2 &lt;- <span class=\"hljs-string\">\"Message from channel 2\"<\/span>\n    }()\n\n    messages := &#91;]<span class=\"hljs-keyword\">string<\/span>{}\n\nLoop:\n    <span class=\"hljs-keyword\">for<\/span> {\n        <span class=\"hljs-keyword\">select<\/span> {\n        <span class=\"hljs-keyword\">case<\/span> msg1 := &lt;-ch1:\n            messages = <span class=\"hljs-built_in\">append<\/span>(messages, msg1)\n        <span class=\"hljs-keyword\">case<\/span> msg2 := &lt;-ch2:\n            messages = <span class=\"hljs-built_in\">append<\/span>(messages, msg2)\n        <span class=\"hljs-keyword\">default<\/span>:\n            <span class=\"hljs-keyword\">if<\/span> <span class=\"hljs-built_in\">len<\/span>(messages) == <span class=\"hljs-number\">2<\/span> {\n                <span class=\"hljs-keyword\">break<\/span> Loop\n            }\n            fmt.Println(<span class=\"hljs-string\">\"Waiting for message...\"<\/span>)\n            time.Sleep(<span class=\"hljs-number\">500<\/span> * time.Millisecond)\n        }\n    }\n    fmt.Println(messages)\n}<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-24\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">Go<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">go<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Output:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-25\" data-shcb-language-name=\"Go\" data-shcb-language-slug=\"go\"><span><code class=\"hljs language-go\">Waiting <span class=\"hljs-keyword\">for<\/span> message...\nWaiting <span class=\"hljs-keyword\">for<\/span> message...\nWaiting <span class=\"hljs-keyword\">for<\/span> message...\nWaiting <span class=\"hljs-keyword\">for<\/span> message...\n&#91;Message from channel <span class=\"hljs-number\">1<\/span> Message from channel <span class=\"hljs-number\">2<\/span>]<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-25\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">Go<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">go<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>How it works.<\/p>\n\n\n\n<p>First, create two channels:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-26\" data-shcb-language-name=\"Go\" data-shcb-language-slug=\"go\"><span><code class=\"hljs language-go\">ch1 := <span class=\"hljs-built_in\">make<\/span>(<span class=\"hljs-keyword\">chan<\/span> <span class=\"hljs-keyword\">string<\/span>)\nch2 := <span class=\"hljs-built_in\">make<\/span>(<span class=\"hljs-keyword\">chan<\/span> <span class=\"hljs-keyword\">string<\/span>)<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-26\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">Go<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">go<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Second, spawn two goroutines, each sending a message to the corresponding channel:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-27\" data-shcb-language-name=\"Go\" data-shcb-language-slug=\"go\"><span><code class=\"hljs language-go\"><span class=\"hljs-keyword\">go<\/span> <span class=\"hljs-function\"><span class=\"hljs-keyword\">func<\/span><span class=\"hljs-params\">()<\/span><\/span> {\n    time.Sleep(<span class=\"hljs-number\">1<\/span> * time.Second)\n    ch1 &lt;- <span class=\"hljs-string\">\"Message from channel 1\"<\/span>\n}()\n\n<span class=\"hljs-keyword\">go<\/span> <span class=\"hljs-function\"><span class=\"hljs-keyword\">func<\/span><span class=\"hljs-params\">()<\/span><\/span> {\n    time.Sleep(<span class=\"hljs-number\">2<\/span> * time.Second)\n    ch2 &lt;- <span class=\"hljs-string\">\"Message from channel 2\"<\/span>\n}()<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-27\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">Go<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">go<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>The first goroutine takes 1 second while the second go routine takes 2 seconds to finish.<\/p>\n\n\n\n<p>Third, initialize a slice that stores the messages received from channels:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-28\" data-shcb-language-name=\"Go\" data-shcb-language-slug=\"go\"><span><code class=\"hljs language-go\">messages := &#91;]<span class=\"hljs-keyword\">string<\/span>{}<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-28\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">Go<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">go<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Fourth, use the <code>for<\/code> and <code>select<\/code> statements to wait for messages from the channels <code>ch1<\/code> and <code>ch2<\/code>:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-29\" data-shcb-language-name=\"Go\" data-shcb-language-slug=\"go\"><span><code class=\"hljs language-go\">Loop:\n    <span class=\"hljs-keyword\">for<\/span> {\n        <span class=\"hljs-keyword\">select<\/span> {\n        <span class=\"hljs-keyword\">case<\/span> msg1 := &lt;-ch1:\n            messages = <span class=\"hljs-built_in\">append<\/span>(messages, msg1)\n        <span class=\"hljs-keyword\">case<\/span> msg2 := &lt;-ch2:\n            messages = <span class=\"hljs-built_in\">append<\/span>(messages, msg2)\n        <span class=\"hljs-keyword\">default<\/span>:\n            <span class=\"hljs-keyword\">if<\/span> <span class=\"hljs-built_in\">len<\/span>(messages) == <span class=\"hljs-number\">2<\/span> {\n                <span class=\"hljs-keyword\">break<\/span> Loop\n            }\n            fmt.Println(<span class=\"hljs-string\">\"Waiting for message...\"<\/span>)\n            time.Sleep(<span class=\"hljs-number\">500<\/span> * time.Millisecond)\n        }\n    }<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-29\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">Go<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">go<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>The for loop has a label <code>Loop<\/code> to terminate the loop inside the <code>switch<\/code> statement.<\/p>\n\n\n\n<p>The first two cases wait for data to be available on channels <code>ch1<\/code> and <code>ch2<\/code>. Once the data is available, they append it to the messages slice.<\/p>\n\n\n\n<p>The <code>default<\/code> branch executes when the data is not available on any channel. It displays the message  <code>\"Waiting for message...\"<\/code>  and pauses 500 ms. <\/p>\n\n\n\n<p>Additionally, the default branch will terminate the loop if the data is available on all channels, by checking the size of the <code>messages<\/code> slice.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Summary<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Use the <code>select<\/code> statement to handle multiple channel operations.<\/li>\n<\/ul>\n<div class=\"helpful-block-content\" data-title=\"\">\n\t<div class=\"wth-question\">Was this tutorial helpful?<\/div>\n\t<div class=\"wth-thumbs\">\n\t\t<button\n\t\t\tdata-post=\"373\"\n\t\t\tdata-post-url=\"https:\/\/www.gotutorial.org\/go-tutorial\/go-select\/\"\n\t\t\tdata-post-title=\"Go Select\"\n\t\t\tdata-response=\"1\"\n\t\t\tclass=\"wth-btn-rounded wth-yes-btn\"\n\t\t>\n\t\t\t<svg\n\t\t\t\txmlns=\"http:\/\/www.w3.org\/2000\/svg\"\n\t\t\t\tviewBox=\"0 0 24 24\"\n\t\t\t\tfill=\"none\"\n\t\t\t\tstroke=\"currentColor\"\n\t\t\t\tstroke-width=\"2\"\n\t\t\t\tstroke-linecap=\"round\"\n\t\t\t\tstroke-linejoin=\"round\"\n\t\t\t\tclass=\"feather feather-thumbs-up block w-full h-full\"\n\t\t\t>\n\t\t\t\t<path\n\t\t\t\t\td=\"M14 9V5a3 3 0 0 0-3-3l-4 9v11h11.28a2 2 0 0 0 2-1.7l1.38-9a2 2 0 0 0-2-2.3zM7 22H4a2 2 0 0 1-2-2v-7a2 2 0 0 1 2-2h3\"\n\t\t\t\t><\/path>\n\t\t\t<\/svg>\n\t\t\t<span class=\"sr-only\"> Yes <\/span>\n\t\t<\/button>\n\n\t\t<button\n\t\t\tdata-response=\"0\"\n\t\t\tdata-post=\"373\"\n\t\t\tdata-post-url=\"https:\/\/www.gotutorial.org\/go-tutorial\/go-select\/\"\n\t\t\tdata-post-title=\"Go Select\"\n\t\t\tclass=\"wth-btn-rounded wth-no-btn\"\n\t\t>\n\t\t\t<svg\n\t\t\t\txmlns=\"http:\/\/www.w3.org\/2000\/svg\"\n\t\t\t\tviewBox=\"0 0 24 24\"\n\t\t\t\tfill=\"none\"\n\t\t\t\tstroke=\"currentColor\"\n\t\t\t\tstroke-width=\"2\"\n\t\t\t\tstroke-linecap=\"round\"\n\t\t\t\tstroke-linejoin=\"round\"\n\t\t\t>\n\t\t\t\t<path\n\t\t\t\t\td=\"M10 15v4a3 3 0 0 0 3 3l4-9V2H5.72a2 2 0 0 0-2 1.7l-1.38 9a2 2 0 0 0 2 2.3zm7-13h2.67A2.31 2.31 0 0 1 22 4v7a2.31 2.31 0 0 1-2.33 2H17\"\n\t\t\t\t><\/path>\n\t\t\t<\/svg>\n\t\t\t<span class=\"sr-only\"> No <\/span>\n\t\t<\/button>\n\t<\/div>\n\n\t<div class=\"wth-form hidden\">\n\t\t<div class=\"wth-form-wrapper\">\n\t\t\t<div class=\"wth-title\"><\/div>\n\t\t\t<textarea class=\"wth-message\"><\/textarea>\n\t\t\t<input type=\"button\" name=\"wth-submit\" class=\"wth-btn wth-btn-submit\" id=\"wth-submit\" \/>\n\t\t\t<input type=\"button\" class=\"wth-btn wth-btn-cancel\" value=\"Cancel\" \/>\n\t\t<\/div>\n\t<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>In this tutorial, you will learn how to use the select statement to manage multiple channel operations.<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":10,"menu_order":28,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-373","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.gotutorial.org\/wp-json\/wp\/v2\/pages\/373","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.gotutorial.org\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.gotutorial.org\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.gotutorial.org\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.gotutorial.org\/wp-json\/wp\/v2\/comments?post=373"}],"version-history":[{"count":4,"href":"https:\/\/www.gotutorial.org\/wp-json\/wp\/v2\/pages\/373\/revisions"}],"predecessor-version":[{"id":379,"href":"https:\/\/www.gotutorial.org\/wp-json\/wp\/v2\/pages\/373\/revisions\/379"}],"up":[{"embeddable":true,"href":"https:\/\/www.gotutorial.org\/wp-json\/wp\/v2\/pages\/10"}],"wp:attachment":[{"href":"https:\/\/www.gotutorial.org\/wp-json\/wp\/v2\/media?parent=373"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}