February 10th, 2025 × #javascript#reactivity#frameworks
JavaScript Signals Explained
Explainer on the concept of signals, which are reactive variables that can automatically cause side effects when they update. Signals are missing from base JS but are being proposed. All frameworks have some implementation of signals built in.
Wes Bos Host
Scott Tolinski Host
JavaScript is missing a built-in way to make variables reactive—but Signals might change that. Scott and Wes break down what Signals are, how they compare to React state, and how different frameworks like Preact, Solid, Vue, and Qwik are already using them.
Show Notes
- 00:00 Welcome to Syntax!
- 01:49 Brought to you by Sentry.io.
- 02:28 Why JavaScript needs reactive variables.
- 03:16 What exactly are signals?
- 04:02 Understanding computed state.
- 04:59 How signals differ from React state.
- 06:12 How different frameworks handle reactivity.
- 07:09 DOM Parts.
- 07:26 HTML Template Instantiation.
- 09:10 Comparing signals across frameworks: Preact, Solid.js, Vue, and more.
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