what is the "===", and whats the big difference between it and the "=="

Question

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

whats does the === mean when working with jquery/javascript? and whats the difference between === and ==?

like i got this code

if ($this.val() != '' || ignore_empty === true) {
        var result = validateForm($this);

        if (result != 'skip') {
            if (validateForm($this)) {
                $input_container.removeClass('error').addClass('success');
            }
            else {
                $input_container.removeClass('success').addClass('error');
            }
        }
    }

and there is the ===

i just want to understand what it does and whats the difference. thanks

http://stackoverflow.com/questions/359494/javascript-vs-does-it-matter-which-equal-operator-i-use — Magnus Winter, Dec 08 '11 at 08:45
@MagnusWinter hehe was just about to post that too... but tried to find the "possible duplicate of" thingie — Holger, Dec 08 '11 at 08:46

dknaack · Accepted Answer · 2011-12-08T08:49:11.347

1

Both are equals operators. but === is type safe.

== This is the equal operator and returns a boolean true if both the 
   operands are equal.

=== This is the strict equal operator and only returns a Boolean true 
    if both the operands are equal and of the SAME TYPE.

for example:

3 == "3" (int == string) results in true

3 === "3" (int === string) results in false

hope this helps

edited Dec 08 '11 at 08:49

answered Dec 08 '11 at 08:47

dknaack

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score 0 · Answer 2 · answered Dec 08 '11 at 08:46

0

== converts data to one type before comparing, === returns false if data of different types. === is preferrable.

answered Dec 08 '11 at 08:46

Oleg

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score 0 · Answer 3 · answered Dec 08 '11 at 08:47

0

Loosely speaking, it provides stricter comparison.

"0" == 0 // true
"0" === 0 // false

For example...

For further info, I recommend following the link Magnus provided.

answered Dec 08 '11 at 08:47

SpaceBison

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what is the "===", and whats the big difference between it and the "=="

3 Answers3