In JavaScript is != same as !== [duplicate]

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

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Is != same as !== in JavaScript?

Solution 1:

They are subtly not the same.

!= checks the value
!== checks the value and type

'1' != 1   // false (these two are the same)
'1' !== 1 // true (these two are **not** the same).

In the previous example. The first half of the expression is a string, the second half is an integer.

Solution 2:

From

http://en.wikipedia.org/wiki/JavaScript_syntax#Operators

!== Not identical

!= Not equal

AND "Identical means equal and of same type."

From

http://docstore.mik.ua/orelly/webprog/jscript/ch05_04.htm

"In JavaScript, numbers, strings, and boolean values are compared by value. ... On the other hand, objects, arrays, and functions are compared by reference. "

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So in summary are they the same? No, because there is an additional test with !== (over !=) for type sameness as well as equalness.