Promise.then(): Each Call Returns a New Promise
Each `.then()` call returns a new promise, letting you chain async tasks sequentially. This is key for multi-step operations like API calls. The footgun is attaching multiple `.then()`s to the original promise, which executes them in parallel, not in sequence.
Think of `.then()` as a promise factory, not just a callback scheduler. Each call returns a *new* promise, allowing you to build a clean, sequential chain of asynchronous operations. This is the standard way to handle multi-step tasks like fetching user data, then their posts. The common footgun is attaching multiple `.then()` handlers to the *original* promise; this executes them in parallel after the first promise resolves, not sequentially as a chain.
Read the original → developer.mozilla.org
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- #promises
- #async
- #node.js
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