# Checking for an array in JavaScript

There is a special method `Array.isArray` that can be used to check whether a variable contains a real array or not. Let's test the method.

An array:

`let test = [1, 2, 3]; let res = Array.isArray(test); console.log(res); // shows true`

An object:

`let test = {a: 1, b: 2, c: 3}; let res = Array.isArray(test); console.log(res); // shows false`

A primitive:

`let test = 'abcde'; let res = Array.isArray(test); console.log(res); // shows false`

A pseudo-array:

`let test = document.querySelectorAll('p'); let res = Array.isArray(test); console.log(res); // shows false`

Given a two-dimensional array:

`let test = [ [1, 2, 3], {a: 1, b: 2, c: 3}, [3, 4, 5], {x: 1, y: 2, z: 3}, ];`

Loop through this array and for each element check if it is an array or not.

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