How to check if a JavaScript value is an array?

Sep 25, 2019

Learn how to determine if a JavaScript value is an array using the Array.isArray() static method, which returns true only for real arrays.

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Sometimes you got passed an object in a function, and you need to check if this is an array.

Maybe if it’s an array you perform some operation, and if it’s not an array you perform something else.

How can you determine if an object is an array?

Use the isArray() static method provided by the Array built-in object, introduced in ECMAScript 5:

const list = [1, 2, 3]
Array.isArray(list) //true

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