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 — kennytm
– kennytm, Commented May 21, 2010 at 16:17

Pepper · Accepted Answer · 2010-05-21 16:17:28Z

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, 2010 at 16:17

Pepper

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Comments

Matchu · Accepted Answer · 2010-05-21 16:16:05Z

0

element.constructor == Array

answered May 21, 2010 at 16:16

Matchu

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Comments

dreadwail · Accepted Answer · 2010-05-21 16:17:48Z

0

Not the cleanest but...

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

answered May 21, 2010 at 16:17

dreadwail

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