{"id":12772,"date":"2016-05-26T12:15:03","date_gmt":"2016-05-26T09:15:03","guid":{"rendered":"https:\/\/www.webcodegeeks.com\/?p=12772"},"modified":"2016-05-23T10:46:58","modified_gmt":"2016-05-23T07:46:58","slug":"es6-beyond-really-like","status":"publish","type":"post","link":"https:\/\/www.webcodegeeks.com\/javascript\/es6-beyond-really-like\/","title":{"rendered":"ES6 and beyond – What i really like"},"content":{"rendered":"

Hi dear software companions. It has been a long time. A lot had happened in between. I even changed a residence :)<\/p>\n

But enough about me. Let’s talk some JavaScript. Recently i have read a book called\u00a0You Don\u2019t Know JS: ES6 & Beyond<\/b> written by\u00a0Kyle Simpson<\/b>. I was fully overwhelmed with the amount of new features and syntax shortcuts (or how people like to call it syntax sugar) in ES6. Until now i did not have any contact with ES6.<\/p>\n

Quite a few things i found interesting. For example one of those things are\u00a0Proxies<\/b>.<\/p>\n

As i was reading about proxies i realized that many times in the past i was thinking how nice it would be to have structure like this available (together with some kind of syntax for classes which is now also available).<\/p>\n

Let’s try to define a really simple Proxy in ES6.\u00a0As you all probably know, proxy is nothing more than a “stand-in” object, which sits in front of real object. It can do some light-weight work or preparation until the real object is ready or created. Of course there are a lot of applications for proxies and software is full of them. You can easily find a lot of examples and explanations.<\/p>\n

Proxy<\/h3>\n

In ES6 we define a proxy by passing the original object and handlers. What are these handlers? Handlers are just a list of specially named functions which we can use to do some work. So here is an example for handlers (sometimes called traps) which are invoked when when a property on an object is accessed and when the property is set:<\/p>\n

var someObject = { a: 1 },\r\n    handlers = { \r\n      get(target, key, context) {\r\n          var value = Reflect.get(target, key, context);\r\n          console.log(`accessing: ${key} and the value is ${value}`);\r\n          return value;\r\n      },\r\n      set(target, key, value, context) {\r\n          console.log(`setting: ${key} to the value ${value}`);\r\n          return Reflect.set(target, key, value, context);  \r\n      }\r\n    },\r\n    proxyObject = new Proxy(someObject, handlers);\r\n \r\nproxyObject.a;\r\nproxyObject.a = 2;\r\nproxyObject.a;\r\n<\/pre>\n
If you run this for example in\u00a0ES6 Fiddle<\/a> you should get output like:<\/p>\n
accessing: a and the value is 1\r\nsetting: a to the value 2\r\naccessing: a and the value is 2\r\n<\/pre>\n
So pretty neat stuff. I really like this syntax and feature in ES6. It is clear and handy. I could also not resist using some template strings which also came with ES6.<\/p>\n
You are probably wondering now how can you know which named functions are available for handlers. Have a look here at
\nMDN<\/a> for a complete list of handler traps available to proxy object.<\/p>\n
You will often use Proxy and Reflect (introduced also in ES6) in combination. Handlers\/traps are called when a meta programming task is executed on an object and the Reflect API is used to execute those tasks directly on the object.<\/p>\n
This is all for now. I will post shortly some more on proxies and how they could be used.<\/p>\n
\n\n\n\n
Reference: <\/span><\/td>\nES6 and beyond – What i really like<\/a> from our WCG partner<\/a> Branislav Vidovic at the Geek stuff :-)<\/a> blog.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
Hi dear software companions. It has been a long time. A lot had happened in between. I even changed a residence :) But enough about me. Let’s talk some JavaScript. Recently i have read a book called\u00a0You Don\u2019t Know JS: ES6 & Beyond written by\u00a0Kyle Simpson. I was fully overwhelmed with the amount of new …<\/p>\n","protected":false},"author":162,"featured_media":920,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9],"tags":[],"class_list":["post-12772","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-javascript"],"yoast_head":"\nES6 and beyond - What i really like - Web Code Geeks - 2026<\/title>\n<meta name=\"description\" content=\"Hi dear software companions. It has been a long time. A lot had happened in between. I even changed a residence :) But enough about me. 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