JavaScript == vs ===

The double equals converts types before comparing; the triple equals does not.

This is one of the most asked JavaScript interview questions.

The short advice is simple: use === unless you have a reason not to.

Example

console.log("5" == 5);
console.log("5" === 5);

The output is true then false.

== converted the string; === compared the types too.

Loose and Strict Equality

== is loose equality: it converts types, then compares.

=== is strict equality: different types are never equal.