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Unravel the concept of JavaScript promises with common examples like fetch calls, database queries, and user permissions. Dive into creating and waiting on promises, resolving/rejecting them, and using async functions. Compare dot then and async await for handling promises effectively.
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Quick takeaways
- Promises in JavaScript act as IOUs for future data completion, with examples like fetch calls and database queries showcasing their utility.
- Creating promises involves methods like 'new Promise', 'promise.withresolvers', and marking functions as async for automatic promise return.
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Introduction to Promises: Understanding the Basics
In this episode, the hosts introduce the concept of promises in JavaScript, highlighting the difference between a regular variable/function and a promise as an IOU for future data completion. Promises are described as a commitment to return data in the future, whether successfully (resolved) or in case of failure (rejected). Examples such as fetch calls, database queries, and user permission requests are used to illustrate the usefulness of promises.
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