Instruction: Explain the concept of Promises and how they are used for asynchronous operations.
Context: This question assesses the candidate's understanding of asynchronous programming in JavaScript, an essential concept for modern web development.
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At its core, a Promise is an object representing the eventual completion or failure of an asynchronous operation. It's a powerful abstraction that allows us to work with asynchronous operations in a more manageable way. A Promise has three states: pending, fulfilled, and rejected. When a Promise is pending, it means the asynchronous operation it represents is still in progress. Once the operation completes successfully, the Promise is fulfilled, and if an error occurs, it is rejected.
Now, let's dive into how Promises are used. In my projects, I often use Promises for data fetching from APIs, processing heavy computations in the background, and handling any asynchronous tasks that require a certain...