Keeping our Promises (and Callbacks)

Firebase’s JavaScript SDK added optional, A+-compatible Promise support as an alternative to callbacks, enabling clearer asynchronous code, simpler error handling, and more composable workflows. Firebase operations such as reading data and running transactions can return Promises, allowing developers to chain tasks with `then`, transform returned values, and avoid deeply nested callback structures. Errors can propagate through a Promise chain until handled with a second `then` callback or the `catch` shorthand, while recovery is possible by returning a replacement Promise and failures can be rethrown through rejected Promises or thrown errors. The update also supports `Promise.all()` for coordinating concurrent operations, such as loading an article, its author’s profile image, and a user’s starred status before rendering results and updating a read counter. Although Firebase-returned Promises work across browsers, developers creating their own Promises for older environments may need a library such as Q.

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