https://github.com/xotic750/find-last-index-x

Search an array from the end and return the matched index.
https://github.com/xotic750/find-last-index-x

array browser ecmascript nodejs

Last synced: 4 days ago
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Search an array from the end and return the matched index.

• Host: GitHub
• URL: https://github.com/xotic750/find-last-index-x
• Owner: Xotic750
• License: mit
• Created: 2015-11-26T15:51:12.000Z (about 9 years ago)
• Default Branch: master
• Last Pushed: 2020-01-31T10:51:39.000Z (almost 5 years ago)
• Last Synced: 2024-12-17T16:52:42.403Z (about 1 month ago)
• Topics: array, browser, ecmascript, nodejs
• Language: JavaScript
• Homepage:
• Size: 3.22 MB
• Stars: 1
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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## find-last-index-x

Search an array from the end and return the matched index.



### `module.exports(array, callback, [thisArg])` ⇒ number ⏏

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

```