Different between == and === in JavaScript examples

In this tutorial, We will have a look, at the difference between == and === in javascript with code examples.

This post covers examples and notes about the comparison of double equal signs(==) and triple equal signs(===) operators in JavaScript.

First, what do equal signs about?

Both operators are used to compare different values.

== is called an equality operator, which applies type coercion, what doe type coercion, It converts the values before comparison.

m==n returns true if m and n are the same values and types, else false.

=== is called identity operators, which do not apply type coercion, not converting the values before conversion.

m===n returns true, if m and n are the same values for strings and the same reference for objects, else false.

Javascript Equal operators(== and ===) Examples

Here are some examples of double equal and three equal operator examples

5=="5"  - true
5==="5" - false

'0' == undefined // true
'0' === undefined // false

null == undefined // true
null === undefined // false

In the above examples,

5==“5”, Comparing number and string, and converted to the same type, i.e numbers, with == checks value(5==5) and type(numbers) are same, returns true. 5===“5” return false as both operands are different(integer and string)

javascript Comparision between == vs === operators

Both operators are applied to two operands or variables.