In Python, there are three useful global functions - map(), filter(), and reduce() - that we can use to work with collections. map() is specifically used to apply a function to each item in an iterable, such as a list, and create a new list with the same number of items, but with modified values. Let’s take a look at an example that demonstrates the use of map(). Suppose we have a list of numbers [1, 2, 3], and we want to double each number in the list....
Discover the Map data structure introduced in ES6 to associate data with keys. Before its introduction, people generally used objects as maps, by associating some object or value to a specific key value. What is a Map A Map data structure allows you to associate data to a key. Before ES6 ECMAScript 6 (also called ES2015) introduced the Map data structure to the JavaScript world, along with Set. Before its introduction, people generally used objects as maps, by associating some object or value to a specific key value:...
The map() function in JavaScript is a crucial method when it comes to programming in a functional manner. An example of using the map() function involves iterating through an array, applying a specified function (f()) to each element, and building a new array with the results: const b = a.map(f); Using map(), we can create a new array from an existing array, and then further filter the result using the filter() function....
Learn how to perform common operations in JavaScript using map(), filter(), reduce(), and find() instead of using loops. Loops are commonly used in programming languages to perform operations on arrays. You can iterate over the elements of an array and perform calculations or operations on them. In this blog post, we’ll explore alternative approaches to using loops by leveraging functional programming concepts. We’ll specifically look at four powerful array functions: map(), filter(), reduce(), and find()....