find-last-index-x
v3.1.2
Search an array from the end and return the matched index.
0/weekUpdated 3 years agoMITUnpacked: 259.3 KB
Published by Graham Fairweather
npm install find-last-index-x
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find-last-index-x
Search an array from the end and return the matched index.
$3
Like findIndex, this method returns an index in the array, if an element
in the array satisfies the provided testing function, except it is peformed
in reverse. Otherwise -1 is returned.
Kind: Exported function
Returns: number - Returns index of positively tested element, otherwise -1.
Throws:
- TypeError If array is null or undefined-
- TypeError If callback is not a function.
| Param | Type | Description |
| --------- | --------------------- | ------------------------------------------------------------------------------------------------------- |
| array | Array | The array to search. |
| callback | function | Function to execute on each value in the array, taking three arguments: element, index and array. |
| [thisArg] | \* | Object to use as this when executing callback. |
Example
``js
import findLastIndex from 'find-index-x';
function isPrime(element, index, array) {
var start = 2;
while (start <= Math.sqrt(element)) {
if (element % start++ < 1) {
return false;
}
}
return element > 1;
}
console.log(findLastIndex([4, 6, 8, 12, 14], isPrime)); // -1, not found
console.log(findLastIndex([4, 6, 7, 12, 13], isPrime)); // 4
``