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:
Example
Try this code »<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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