array-find-index

What is array-find-index?

The array-find-index npm package provides a simple utility to find the index of the first element in an array that satisfies a provided testing function. It is a lightweight and straightforward alternative to the native Array.prototype.findIndex method, particularly useful in environments where polyfills are not available or desired.

What are array-find-index's main functionalities?

Find Index of First Matching Element

This feature allows you to find the index of the first element in an array that satisfies the provided testing function. In this example, the function isLargeNumber checks if an element is greater than 13, and findIndex returns the index of the first element that meets this condition.

const findIndex = require('array-find-index');
const array = [5, 12, 8, 130, 44];
const isLargeNumber = (element) => element > 13;
const index = findIndex(array, isLargeNumber);
console.log(index); // Output: 3

Other packages similar to array-find-index

lodash.findindex

Lodash is a popular utility library that provides a wide range of functions for common programming tasks. The lodash.findindex method is similar to array-find-index, offering the ability to find the index of the first element in an array that matches a given predicate. Lodash is more feature-rich and includes many other utilities, making it a heavier dependency compared to array-find-index.

array.prototype.findindex

This package is a polyfill for the native Array.prototype.findIndex method, which is available in modern JavaScript environments. It provides the same functionality as array-find-index but is intended for use in environments where the native method is not available. It is a direct drop-in replacement for the native method.

README

array-find-index

ES2015 Array#findIndex() ponyfill

Install

$ npm install --save array-find-index

Usage

const arrayFindIndex = require('array-find-index');

arrayFindIndex(['rainbow', 'unicorn', 'pony'], x => x === 'unicorn');
//=> 1

API

Same as Array#findIndex(), but with the input array as the first argument.

License

MIT © Sindre Sorhus