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JavaScript - check if variable is array type

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Created by:
Root-ssh
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In this article, we would like to show you how to check if an object or variable is array type using JavaScript.

1. Built-in Array.isArray method example

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2. instanceof operator test example

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Note: if web browser does not support Array.isArray method this approach is useful.

3. constructor property test example

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Note: if web browser does not support Array.isArray method this approach is useful.

4. toString result test example (Polyfill extension)

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Note: if web browser does not support Array.isArray method this approach is useful.

Alternative titles

  1. JavaScript - check if object is array type
  2. JavaScript - detect if passed argument is array
  3. JavaScript - detect if passed parameter is array
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