Mastering Loops with Promises in JavaScript

Simplify your asynchronous operations by learning how to loop through promises effectively

Photo by Clay Banks on Unsplash

Asynchronous programming is an essential part of modern web development. With the rise of AJAX requests, file system access, and other non-blocking I/O tasks, managing callbacks can become cumbersome quickly.

Enter promises — they help simplify asynchronous workflows, making it easier to manage dependencies between different functions. However, what happens when you need to perform similar actions on multiple promises? That’s where loops come into play.

Let’s dive into looping through promises in JavaScript.

Let’s start with understanding why we might want to use a promise inside a loop. Imagine you are fetching data from several API endpoints concurrently or performing separate database queries before rendering a page. Instead of nesting all these calls together, which would lead to unreadable spaghetti code, using Promise.all() along with a loop provides a cleaner solution.

First, let’s create some sample async functions returning promises:

const getData = () => {
  return new Promise((resolve) => setTimeout(() => resolve('data'), 500));
};

const anotherAsyncFunction = () => {
  return new…