Equal-to Comparison Operator

In JavaScript, Equal-to comparison operator takes two operands, returns true if left and right operands are equal in value, or false if not.

Syntax

== symbol is used for comparison equal-to operator.

a == 5  //returns true if a has a value of 5
a == b  //returns true if a and b has same value

Equal-to operator does not check if the operands are of same data type, but only checks if they have same value.

a = 5    //a has a value of 5
a == '5' //returns true
a == 5   //returns true

1. Check if value of a is equal to 5.

var a = 5;
if (a == 5) {
    console.log('value of a is 5');
} else {
    console.log('value of a is not 5');
}

2. Check if values in a and b are equal to each other.

var a = 5;
var b = 7;
if (a == b) {
    console.log('a and b are equal in value');
} else {
    console.log('a and b are not equal in value');
}

3. Check if value in a is equal to 5.

var a = '5';
if (a == 5) {
    console.log('value of a is 5');
} else {
    console.log('value of a is not 5');
}

a is assigned with a string type value. Comparison equal-to operator does not check the type, but only value.