How to Check If Object is an Array in JavaScript

  427 views   10 months ago Javascript

Use the Array.isArray() Method

You can use the JavaScript Array.isArray() method to check whether an object (or a variable) is an array or not. This method returns true if the value is an array; otherwise returns false.

Let's check out the following example to understand how it works:

    // Creating some variables
    var v1 = {name: "John", age: 18};   
    var v2 = ["red", "green", "blue", "yellow"];
    var v3 = [1, 2, 3, 4, 5];
    var v4 = null;
    // Testing the variables data type
    typeof(v1); // Returns: "object"
    typeof(v2); // Returns: "object"
    typeof(v3); // Returns: "object"
    typeof(v3); // Returns: "object"
    // Testing if the variable is an array
    Array.isArray(v1);  // Returns: false
    Array.isArray(v2);  // Returns: true
    Array.isArray(v3);  // Returns: true
    Array.isArray(v4);  // Returns: false

The Array.isArray() method is supported in all major browsers, such as Chrome, Firefox, IE (9 and above)

Author : Harsukh Makwana
Harsukh Makwana

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