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> |
chevron_right
filter_none
Output:
true
Program 2:
<script> // JavaScript code for isArray() function function func() { document.write(Array.isArray({foo: 123})); } func(); </script> |
chevron_right
filter_none
Output:
false
Program 3:
<script> // JavaScript code for isArray() function function func() { document.write(Array.isArray('foobar')); } func(); </script> |
chevron_right
filter_none
Output:
false
Recommended Posts:
- Map.has( ) In JavaScript
- Map.get( ) In JavaScript
- this in JavaScript
- Map in JavaScript
- Loops in JavaScript
- Objects in Javascript
- Math.max() In JavaScript
- JavaScript | Events
- Math.min( ) In JavaScript
- Math.sin( ) In JavaScript
- JavaScript | match()
- JavaScript | WeakSet
- JavaScript | Array pop()
- Prototype in JavaScript
- Difference between JavaScript and Php
If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.
Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.