JavaScript Promises

Promises From The Ground Up

Josh Comeau

The article provides a detailed explanation of JavaScript Promises, a fundamental concept in asynchronous programming in JavaScript. Asynchronous code, achieved through functions such as setTimeout(), runs without blocking the main thread, allowing other tasks to be performed simultaneously. However, callbacks, used in tandem with asynchronous functions, can lead to a situation known as “Callback Hell”, which promises attempt to resolve by providing a way to chain asynchronous functions together. JavaScript Promises can be fulfilled, rejected, or pending, and come equipped with .then and .catch methods for handling the result. The async/await syntax in modern JavaScript is essentially syntactic sugar that allows for a more intuitive way to write Promises. Lastly, the author offers a detailed walkthrough of how Promises can be effectively implemented in various scenarios.

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