Flavio Copes

How to check if a JavaScript value is an array?

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Published Sep 25 2019

Find out how to determine if a JavaScript value is an array using the `Array.isArray()` method

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