JavaScript Boolean

In this article, we will study Boolean in Javascript. Boolean is one of the data types of javascript that has true or false values. Boolean is used to specify whether the given condition is true or false.

Note: Except 0, NaN, and undefined all values are considered to be true. These values are supposed to be false always.

Boolean() function in JavaScript

The boolean () function returns the Boolean value (true or false) of a given variable, value, or expression.

Example 1:

Boolean(12)

Output :

true

Example 2:

a = 10
console.log(Boolean(a))

Output :

true

Example 3:

a = 0
console.log(Boolean(a))

Output :

false

Example 4:

console.log(Boolean(NaN))

Output :

false

We can also create a Boolean object of a value using a new operator

Boolean Object Syntax in JavaScript

var variable = new Boolean(value)

If you omit the value here then it will give the Boolean value ‘false’.

Example :

var a = new Boolean()
console.log(a)
var b = new Boolean('A')
console.log(b)
var c = new Boolean(10)
console.log(c)
var d = new Boolean(" ")
console.log(d)
var e = new Boolean(0)
console.log(e)

Output :

Boolean {false}
Boolean {true}
Boolean {true}
Boolean {true}
Boolean {false}

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Comparison Operators and Conditions

Operator	Name	Example
<	Less than	12<19 (true)
>	Greater than	12>10(true)
<=	Less than equal to	12<=9 (false)
>=	Greater than equal to	12>=9 (true)
==	Equal to	12==12(true)
!=	Not equal to	12!=12(false)

Comparison operators always return a Boolean value that is true or false. The condition to be made with the help of the comparison operator also returns true or false.

Example 1:

console.log(1>2)

Output :

false

Example 2:

console.log(1==1)

Output :

true

Example 3:

console.log(8>6)

Output :

true