Last Updated : 15 Jul, 2024
The JavaScript Array lastIndexOf() Method is used to find the index of the last occurrence of the search element provided as the argument to the function.
Syntax:array.lastIndexOf(element, start)Parameters:
This method accepts two parameters as mentioned above and described below:
This method returns the index of the last occurrence of the element. If the element cannot be found in the array, then this method returns -1.
Example 1: Below is an example of the Array lastIndexOf() method.
javascript
let name = ['gfg', 'cse', 'geeks', 'portal'];
a = name.lastIndexOf('gfg')
// Printing result of method
console.log(a);
Output:
0
Example 2: In this example, the method will be searched for element 2 in that array and return that element index.
javascript
// Taking input as an array A
// having some elements.
let A = [1, 2, 3, 4, 5];
// lastIndexOf() method is called to
// test whether the searching element
// is present in given array or not.
a = A.lastIndexOf(2)
// Printing result of method.
console.log(a);
Output:
1
Example 3: In this example, the method will search for the element 9 in that array if not found then return -1.
javascript
// Taking input as an array A
// having some elements.
let name = ['gfg', 'cse', 'geeks', 'portal'];
// lastIndexOf() method is called to
// test whether the searching element
// is present in given array or not.
a = name.lastIndexOf('cat')
// Printing result of method
console.log(a);
Output:
-1
We have a complete list of Javascript Array methods, to check those please go through this Javascript Array Complete reference article.
Supported Browsers:The browsers supported by JavaScript Array lastIndexOf() method are listed below:
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HTML:
3.2
| Encoding:
UTF-8
| Version:
0.7.4