Syntax - Tasty Web Development Treats 765: JS Promises Fundamentals - Part 1
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May 6, 2024 Dive into the world of JavaScript promises and discover what makes them essential for handling asynchronous operations. The hosts break down the basics, comparing promises to callbacks and highlighting their importance in scenarios like API fetch calls and database operations. Learn how to create promises, understand resolving and rejecting them, and explore the power of async functions. Plus, find out why choosing the right wait method can enhance your coding efficiency and readability!
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Promises as IOUs
- A JavaScript promise represents the eventual completion of data, acting as an IOU.
- This differs from regular variables or function returns, which provide immediate results.
Fetch Calls and Promises
- Fetch calls exemplify promises, initiating data retrieval and returning a promise.
- The promise resolves with data upon successful retrieval or rejects if the fetch fails.
Database Operations and Promises
- Database queries or inserts are common promise examples, preventing blocking operations.
- ORMs return promises, resolving with data or a success message upon completion.