Question

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JavaScript === vs == : Does it matter which “equal” operator I use?
Javascript operator !==

What’s the difference between != and !==?

Can you give me an example where using != gives another result than using !==?

Answer 1

alert(1 != true);
alert(1 !== true);

The first one is false, the second true.

• != accept 1 as equals of true, null as equals of false and some others (because the values are automatically casted when being compared).
• !== accept only “real” equalities (i.e. compares both the value and the type).

Example