In computer programming, a callback is a programming pattern in which a function reference is passed from one context (consumer) to another (provider) such that the provider can call the function.

"I will call back later!" A callback is a function that runs "later". A callback runs after another function finishes. Callbacks were the first solution for asynchronous JavaScript.

May 5, 2009 · In programming words, a function leaves a reference of itself to another piece of code, e.g. by registering, and the other code uses this reference to call the (callback) function when …

Aug 19, 2025 · Synchronous callbacks are called immediately after the invocation of the outer function, with no intervening asynchronous tasks, while asynchronous callbacks are called at some point later, …

Jan 17, 2026 · Callbacks allow one function to call another at a later time. A callback function can execute after another function has finished. console.log("Goodbye!"); Here, sayBye () is passed as a …

Mar 18, 2024 · Using callbacks, the training function can add functionality to high-level API training procedures. This allows us to incorporate features such as advanced logging, model saving, and …

Jul 3, 2024 · Callback functions help manage asynchronous operations, ensuring that the code continues to run smoothly without waiting for tasks to complete. This approach is crucial for …

Jun 18, 2022 · To demonstrate the use of callbacks, promises and other abstract concepts, we’ll be using some browser methods: specifically, loading scripts and performing simple document …

Jun 24, 2025 · JavaScript callbacks are simple yet powerful. They let you manage tasks that take time, like file reads or network requests, without stopping the rest of your code.

In this tutorial, you will learn about JavaScript callbacks and how they are used to handle asynchronous operations.