What is the difference between != and !== operators in JavaScript?

Roberto_Sebestyen_66803 0
Viewed 18468

What is the difference between the !== operator and the != operator in JavaScript? Does it behave similarly to the === operator where it compares both value and type?

operators javascript
3 Answers

Yes, it's the same operator like ===, just for inequality:

!== - returns true if the two operands are not identical. This operator will not convert the operands types, and only returns false if they are the same type and value. —Wikibooks

user_730700

Yes, !== is the strict version of the != operator, and no type coercion is done if the operands are of different type:

0 != ''            // false, type coercion made
0 != '0'           // false
false != '0'       // false

0 !== ''           // true, no type coercion
0 !== '0'          // true
false !== '0'      // true
CMS_54450

I was about to post this W3Schools page, but funnily enough it didn't contain this operator!

At least, the !== is indeed the inverse of === which tests the equality of both type and value.

user_1578820
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