How to check that value is an array?

Question

Is there a good built-in way that I can find whether value is a array or not?

One simple check I can think of is as follows, but I don't like it:

if(ele.push){ /* its array it has push method */ }

I mean i would like know if something like pseudo-code below exists. typeof doesn't seems to be applicable, as it only returns "object" (though that makes sense).

function x(ele){ if(isArray(ele)){ /* dosomething() */ } }

possible duplicate of [How to detect if a variable is an array](http://stackoverflow.com/questions/1058427/how-to-detect-if-a-variable-is-an-array) — kennytm, May 21 '10 at 16:17

score 2 · Accepted Answer · answered May 21 '10 at 16:17

2

http://www.andrewpeace.com/javascript-is-array.html

<script type="text/javascript">
  function is_array(input){
    return typeof(input)=='object'&&(input instanceof Array);
  }
</script>

answered May 21 '10 at 16:17

Pepper

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score 0 · Answer 2 · answered May 21 '10 at 16:16

0

element.constructor == Array

answered May 21 '10 at 16:16

Matchu

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score 0 · Answer 3 · answered May 21 '10 at 16:17

0

Not the cleanest but...

function isArray(obj) {
    return obj.constructor == Array;
}

answered May 21 '10 at 16:17

dreadwail

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How to check that value is an array?

3 Answers3