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array-filter

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array-filter

Array#filter for older browsers.


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What is array-filter?

The array-filter npm package provides a simple utility for filtering elements in an array based on a provided callback function. It is a lightweight and straightforward implementation of the Array.prototype.filter method, making it useful for environments where the native method is not available or for those who prefer a minimalistic approach.

What are array-filter's main functionalities?

Basic Filtering

This feature allows you to filter an array of numbers to only include even numbers. The callback function checks if each number is even.

const filter = require('array-filter');
const numbers = [1, 2, 3, 4, 5];
const evenNumbers = filter(numbers, function(number) {
  return number % 2 === 0;
});
console.log(evenNumbers); // [2, 4]

Filtering with Custom Conditions

This feature demonstrates filtering an array of strings to only include words longer than 5 characters. The callback function checks the length of each word.

const filter = require('array-filter');
const words = ['apple', 'banana', 'cherry', 'date'];
const longWords = filter(words, function(word) {
  return word.length > 5;
});
console.log(longWords); // ['banana', 'cherry']

Filtering Objects in an Array

This feature shows how to filter an array of objects to only include those where the age property is 30 or above. The callback function checks the age property of each object.

const filter = require('array-filter');
const people = [
  { name: 'Alice', age: 25 },
  { name: 'Bob', age: 30 },
  { name: 'Charlie', age: 35 }
];
const adults = filter(people, function(person) {
  return person.age >= 30;
});
console.log(adults); // [{ name: 'Bob', age: 30 }, { name: 'Charlie', age: 35 }]

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Package last updated on 18 May 2015

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