Feb 15, 2024 · The filter method in JavaScript provides a concise and efficient way to selectively extract elements from arrays based on specified conditions. Understanding its syntax, functionality, common use cases, and best practices empowers developers to write cleaner, more maintainable code.

The filter() method creates a new array filled with elements that pass a test provided by a function. The filter() method does not execute the function for empty elements. The filter() method does not change the original array.

Jan 14, 2021 · The filter function is called on an array and — like map — takes in one parameter: a callback. It performs this callback function on every element in the array, and includes the element in a new array if the callback returns true.

Apr 5, 2023 · In this guide, you'll learn how to filter an array in JavaScript with the filter() method. You'll learn how to use the context, index and array arguments, as well as how to chain filter() with map(), indexOf() and find(), through practical code examples.

Mar 13, 2025 · The filter() method of Array instances creates a shallow copy of a portion of a given array, filtered down to just the elements from the given array that pass the test implemented by the provided function.

Aug 28, 2017 · You should use filter method, which accepts a callback function. The filter() method creates a new array with all elements that pass the test implemented by the provided function. Also, use typeof operator in order to find out the type of item from array.

This tutorial shows you how to use the JavaScript array filter() method to filter elements in an array based on a specified condition.

Nov 10, 2019 · Map, reduce, and filter are all array methods in JavaScript. Each one will iterate over an array and perform a transformation or computation. Each will return a new array based on the result of the function. In this article, you will learn why and how to use each one. Here is a fun summary by Steven Luscher:

Aug 26, 2021 · The filter() array method filters out item(s) which match the callback expression and returns them. In addition to the callback function, the filter method can also take in a context object as the second argument.

Mar 11, 2022 · filter() method calls the argument function on each element of the array. It creates a new array by finding all values for which the argument function returns true. For other elements, for which it returns false, are skipped. Let’s learn how filter() works with different examples. Example of filter() with callback function: