Javascript Programming Tutorials, Guides & Best Practices

Metaprogramming is a programming technique where programs have the ability to treat other programs as their data. In JavaScript, this often involves writing code that can inspect or modify other code at runtime. JavaScript provides powerful tools for metaprogramming, including Symbols, the Reflect API, and Proxies.

Symbols were introduced in ES6 as a new primitive data type, alongside strings, numbers, and booleans. A Symbol is a unique and immutable value that can be used as the key for object properties.

A promise is an object representing the eventual completion or failure of an asynchronous operation. Promises provide a cleaner and more manageable way to handle asynchronous tasks compared to callbacks.

Creating a Promise: