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How to Check If Object is an Array in JavaScript

Topic: JavaScript / jQueryPrev|Next

Answer: 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:

  • <script>
  •     // 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
  • </script>

The Array.isArray() method is supported in all major browsers, such as Chrome, Firefox, IE (9 and above), etc. See the tutorial on JavaScript arrays to learn more the arrays.


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