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JavaScript | Array.isArray()

Array.isArray() function determines whether the value passed to this function is an array or not. This function returns true if the argument passed is array else it returns false. The syntax of this function is as follows:

Array.isArray(obj)

Argument
Here obj is any valid object in JavaScript like map, list, array, string, etc.
Return value
This function returns Boolean value true if the argument passed is array otherwise it returns false

Examples for the above function are as follows:



Example 1:

Input:
print(Array.isArray(['Day','Night','Evening']));

Output:
true

Since the argument passed to the function isArray() is an array therefore this function returns true as the answer.

Example 2:

Input:
print(Array.isArray({foo: 123}));

Output:
false

Since the argument passed to the function isArray() is a map therefore this function returns false as the answer.
Example 3:



Input:
print(Array.isArray('foobar'));

Output:
false

Since the argument passed to the function isArray() is a string therefore this function returns false as the answer.

Codes for the above function are as follows:

Program 1:

<script>
// JavaScript code for isArray() function
function func() {
    document.write(Array.isArray(['Day','Night','Evening']));
}
  
func();
</script>

Output:

true

Program 2:

<script>
// JavaScript code for isArray() function
function func() {
    document.write(Array.isArray({foo: 123}));
}
  
func();
</script>

Output:

false

Program 3:

<script>
// JavaScript code for isArray() function
function func() {
    document.write(Array.isArray('foobar'));
}
  
func();
</script>

Output:

false


This article is attributed to GeeksforGeeks.org

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