3 ways to tell if a variable is an Array in JavaScript

There are several ways of checking if a variable is an array or not. The best solution is the one you have chosen.

Method #1

variable.constructor === Array

This is the fastest method on Chrome, and most likely all other browsers. All arrays are objects, so checking the constructor property is a fast process for JavaScript engines.

If you are having issues with finding out if an objects property is an array, you must first check if the property is there.

Method #2

variable.prop && variable.prop.constructor === Array

Lastly, another way to tell if a variable is an Array is as so.

Method #3

Array.isArray(variable)

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