JavaScript (ES2026) reference · Array Methods

JavaScript Array.isArray() Method

Return true if a value is an array. More reliable than typeof, which reports 'object' for arrays.

JavaScript (ES2026) Since ES5

Syntax

Array.isArray(value)

Parameter	Description
`value`	Any value.

true or false.

Check for arraysTry it yourself

console.log(Array.isArray([1, 2]), Array.isArray("text"), Array.isArray({ length: 0 }));
console.log(typeof [1, 2]);

Output

true false false
object

Accept one value or manyTry it yourself

function toList(x) {
  return Array.isArray(x) ? x : [x];
}
console.log(toList(5), toList([5, 6]));

Output

[ 5 ] [ 5, 6 ]

Version	Change
JavaScript ES5	Added

Array.from() · Create a new array from an iterable or array-like object, with an optional function to map each element.
Array.of() · Create a new array from its arguments. Unlike Array(3), Array.of(3) makes [3], not an empty array of length 3.
JavaScript Arrays · tutorial
JavaScript Array Methods · tutorial