The difference between the == and === operators in JavaScript

The == operator compares the abstract equality, that is, it performs the necessary type conversions before comparing the equality. The === operator compares strict equality, meaning that it will not perform type conversions.

In JavaScript, the == and === operators are used to compare between two operands.

The == operator abstracts, that is, it makes the necessary type conversions before comparing the equality. Syntax of comparison: a == b .

The === operator compares strict equality, meaning that it will not perform type conversions. So if two values are not of the same type, then when compared, the result will return false. Syntax of comparison: a === b .

The difference between the == and === operators in JavaScript Picture 1 — The == and === operators in Javascript

Example 1:

Output:

 true false

Example 2:

Output:

 true false

Example 3:

Output:

 true false

In general, the === operator is recommended because it never performs type conversions when making comparisons, so it always produces accurate results.

Readers can learn more about other operators in the article: Operators in JavaScript.