Difference between == and === in JS

Question

Possible Duplicates:
Difference between == and === in JavaScript
Javascript === vs == : Does it matter which “equal” operator I use?

What's the difference between == and ===? Also between !== and !==?

Answer 1

There are lots of answers to this question on Stackoverflow already.

Short:

== only compares values

=== compares values + type

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var check1 = '10',
    check2 = 10;

check1 == check2 // true
check1 === check2 // false