JavaScript Promises: Handling Future Values
A Promise is an IOU for a future value from an async operation. Instead of blocking your code, you get an object that will eventually contain the result or an error. They're essential for API calls or file reads.
A Promise is an IOU for a value that isn't ready yet. Instead of blocking your program waiting for a network request, JavaScript gives you a promise object that represents the eventual result. This is the backbone of modern async JS, used for API calls and file I/O. The main footgun is forgetting to add a `.catch()` block. An unhandled rejection can crash a Node.js application, so always account for the failure path, not just the successful one.
Read the original → developer.mozilla.org
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- #asynchronous
- #node.js
- #promises
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