Typed Array findLastIndex()
Example
// Create a Typed Array
const myArr = Int16Array.from([10,15,20,25,30,35,40,45,50]);
// The index of the last element with a value over 18
let result = myArr.findLastIndex(x => x > 18);
Try it Yourself »
Description
The findLastIndex() method executes a function for each array element.
The findLastIndex() method returns the index (position) of the last element that passes a test.
The findLastIndex() method returns -1 if no match is found.
The findLastIndex() method does not execute the function for empty array elements.
The findLastIndex() method does not change the original array.
Syntax
typed-array.findLastIndex(function(currentValue, index, arr), thisValue)
|
typed-array must be one of the following: Int8ArrayUint8Array Uint8ClampedArray Int16Array Uint16Array Int32Array Uint32Array Float16Array Float32Array Float64Array BigInt64Array BigUint64Array |
Parameters
| Parameter | Description |
| function() | Required. A function to be run for each array element. |
| currentValue | Required. The value of the current element. |
| index | Optional. The index of the current element. |
| arr | Optional. The array of the current element. |
| thisValue | Optional. Default undefined.A value passed to the function as its this value. |
Return Value
| Type | Description |
| Number |
The index of the last element that passes the test. Otherwise -1. |
Typed Array Find Methods:
| Method | Finds |
|---|---|
| includes() | Returns true if an element is present in the array |
| indexOf() | The index of the first element with a specified value |
| lastIndexOf() | The index of the last element with a specified value |
| find() | The value of the first element that passes a test |
| findIndex() | The index of the first element that passes a test |
| findLast() | The value of the last element that passes a test |
| findLastIndex() | The index of the last element that passes a test |
JavaScript Typed Arrays
Browser Support
typed-array.findLastIndex() is a JavaScript 2023 feature.
ES 2023 is supported in all modern browsers since July 2023:
| Chrome 110 |
Edge 110 |
Firefox 115 |
Safari 16.4 |
Opera 96 |
| Feb 2023 | Feb 2023 | Jul 2023 | Mar 2023 | May 2023 |
