Info

Comparison between the different ways of checking if a value is an array.

Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var A = [1, 2, 3, 4, 5],
    B = ['a', 'b', 'c', 'd', 'e'],
    C = [[1, 2], [3, 4], [5, 6], [7, 8], [9, 10]];
  };
</script>

Test runner

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A instanceof Array ? true : false;

B instanceof Array ? true : false;

C instanceof Array ? true : false;

Array.isArray(A) ? true : false;

Array.isArray(B) ? true : false;

Array.isArray(C) ? true : false;

A.constructor === Array ? true : false;

B.constructor === Array ? true : false;

C.constructor === Array ? true : false;

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Revisions

You can edit these tests or add even more tests to this page by appending /edit to the URL. Here’s a list of current revisions for this page:

• Revision 1: published by Brian Jemilo II 2 weeks ago
• Revision 2: published by Artur Raczyński 1 day ago

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