JavaScript Array findLastIndex()Method

Examples

Find the last element with a value greater than 18:

const ages = [3, 10, 18, 20]; ages.findLastIndex(checkAge); function checkAge(age) { return age > 18; }

Output:

Google,JYSHARE,Example,Taobao

The findLastIndex() method executes a function for each array element.

The findLastIndex() method returns the index (position) of the last element that passes the test.

If no match is found, it returns -1.

The findLastIndex() method does not execute the function for empty array elements.

The findLastIndex() method does not change the original array.

Array Search Methods:

Method	Description
`indexOf()`	Find the index of the first element with a specified value
`lastIndexOf()`	Find the index of the last element with a specified value
`find()`	Find the value of the first element that passes the test
`findIndex()`	Find the index of the first element that passes the test
`findLast()`	Find the value of the last element that passes the test
`findLastIndex()`	Find the index of the last element that passes the test

findLastIndex() is an ES2023 feature, supported by 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

array.findLastIndex(function(currentValue, index, arr), thisValue)

Parameter	Description
function	Required. The function to 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, defaults to undefined. A value passed as the function's this value.

Type	Description
Numbe	The index of the last element that passes the test; otherwise -1.

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