JavaScript Array lastIndexOf() Method
Example
Search an array for the item "Apple":
var fruits = ["Banana", "Orange", "Apple", "Mango"];
var a = fruits.lastIndexOf("Apple");
The result of a will be:
2
Meaning that "Apple" is located at position 2 in the array.
Try it Yourself »More "Try it Yourself" examples below.
Definition and Usage
The lastIndexOf() method searches the array for the specified item, and returns it's position.
The search will start at the specified position, or at the end if no start position is specified, and end the search at the beginning of the array.
Returns -1 if the item is not found.
If the item to search for is present more than once, the lastIndexOf method returns the position of the last occurence.
Tip: If you want to search from start to end, use the indexOf() method
Browser Support
The numbers in the table specify the first browser version that fully supports the method.
| Method | |||||
|---|---|---|---|---|---|
| lastIndexOf() | Yes | 9.0 | Yes | Yes | Yes |
Syntax
array.lastIndexOf(item,start)
Parameter Values
| Parameter | Description |
|---|---|
| item | Required. The item to search for |
| start | Optional. Where to start the search. Negative values will start at the given position counting from the end, and search to the beginning |
Technical Details
| Return Value: | A Number, representing the position of the specified item, otherwise -1 |
|---|---|
| JavaScript Version: | 1.6 |
More Examples
Example
Search an array for the item "Apple":
var fruits = ["Banana", "Orange", "Apple", "Mango", "Banana", "Orange", "Apple"];
var a = fruits.lastIndexOf("Apple");
The result of a will be:
6
Try it Yourself »
Example
Search an array for the item "Apple", starting the search at position 4:
var fruits = ["Banana", "Orange", "Apple", "Mango", "Banana", "Orange", "Apple"];
var a = fruits.lastIndexOf("Apple", 4);
The result of a will be:
2
Try it Yourself »
JavaScript Array Reference
