JavaScript Array isArray() Method

The isArray() method is used to test whether the value passed is an array. If it finds the passed value is an array, it returns True. Otherwise, it returns False.

Syntax

Parameter

obj_value: It is the value of the object which is passed for determining whether it is an array or not.

Return

It returns either false or true, depending on the test.

JavaScript Array isArray() Method Example

Let's see the below implementations and determine if the value is an array.

Example1

This example shows a basic implementation of isArray() method.

Output:

It is clear that the passed values were not forming any array. Thus, the result is false.

Example2

In this example, we will pass an array and check the resultant.

Output:

Hence, the output says that the passed value is an array.

Example3

Let's check what if we pass 'null' as an object value.

Output:

Example4

Here is the code implementation where the object value is passed as 'undefined'.

Output:

Example5

Determining the object value and invoking the functions accordingly.

Output:

Function f1() is invoked because the value passed is an array.

Example6

When we pass the object value as 'True'.

Output:

It shows that value is not in the form of an array.