25 Feb JavaScript Booleans
A Boolean object in JavaScript has two values true and false. Let us see how to create a Boolean and Boolean object. We will also see the Boolean properties and methods with live running examples.
Create a Boolean and Boolean object
Let us see how to create a Boolean:
let b = true;
We can create a Boolean object using the new keyword:
let b = new Boolean(true);
JavaScript Boolean Properties
We have a constructor property in the Boolean object. Let us understand the property with an example.
boolean.constructor
Using the constructor property, a reference to the Boolean function is returned. This function created the object. Let us see an example:
<!DOCTYPE html>
<html>
<body>
<h1>JavaScript Boolean</h1>
<p id="test"></p>
<script>
var b = new Boolean( );
document.getElementById("test").innerHTML = b.constructor
</script>
</body>
</html>
Output
JavaScript Boolean Methods
We have built-in methods for the Boolean object. Let us understand some of the methods with examples:
- toString()
- valueOf()
JavaScript toString() method
Use the toString() method to return the string representation based on the value of the object. Let us see an example:
<!DOCTYPE html>
<html>
<body>
<h1>JavaScript Boolean</h1>
<p id="test"></p>
<script>
// Boolean object
var b = new Boolean(true);
// Return the string representation
document.getElementById("test").innerHTML = b.toString()
</script>
</body>
</html>
Output
JavaScript valueOf() method
Use the valueOf() method in JavaScript to return the Boolean object. Let us see an example:
<!DOCTYPE html>
<html>
<body>
<h1>JavaScript Boolean</h1>
<p id="test"></p>
<script>
// Boolean object
var b = new Boolean(false);
// Return the value of the Boolean object
document.getElementById("test").innerHTML = b.valueOf()
</script>
</body>
</html>
Output
No Comments