What’s the difference between == and === in JavaScript?

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What’s the difference between == and === in JavaScript?

asked 404 days ago

I often see people use == (double equals) and sometimes === (triple equals). What’s the practical difference, and when should I use one over the other?

javascript

nodejs

1 Answer

Dev

• answered 403 days ago

== performs type coercion before comparison:

10 == '0'       // true
2'' == false    // true
3null == undefined // true

10 == '0'       // true
2'' == false    // true
3null == undefined // true

=== checks strict equality without coercion:

10 === '0'      // false
2'' === false   // false
3null === undefined // false

10 === '0'      // false
2'' === false   // false
3null === undefined // false

Best practice: Always use === to avoid unexpected type coercion bugs.

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