TypeScript Array.isArray() Method

In TypesScript the isArray() method returns true if the value passed as a parameter is a type of array. If the value is indeed an array the function will return true, otherwise it will return false.

Syntax:

Array.isArray(value: any): boolean

Parameters

• value: The value that will be checked for array type.

Return Value

If the given value is an array then it returns true otherwise returns false.

Example 1: In the below example we are checking if the given variable geek is an array or not.

Javascript

const geeks: string[] =
    ['GFG', "Geeks", 'TypeScript'];
const num: number = 21;

console.log(Array.isArray(geeks));
console.log(Array.isArray(num));

Output:

true
false

Example 2: In the below example we are checking if the given variable geek is an array or not.

Javascript

const geeks: string = "Geeksforgeeks";
const array: number[] =
    [1, 2, 3, 4, 5];

console.log(Array.isArray(geeks) ?
    "Passed Value is an Array" :
    "Passed Value is not an Array");

console.log(Array.isArray(array) ?
    "Passed Value is an Array" :
    "Passed Value is not an Array");

Output:

Passed Value is not an Array
Passed Value is an Array