Understanding Reactive Variables and Signals in JavaScript

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.

• 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?
  • Signals Proposal.
• 04:02 Understanding computed state.
• 04:59 How signals differ from React state.
• 06:12 How different frameworks handle reactivity.
• 07:09 DOM Parts.
  • Pull Request.
• 07:26 HTML Template Instantiation.
  • Template Instantiation.
• 09:10 Comparing signals across frameworks: Preact, Solid.js, Vue, and more.
  • PreactJS Signals.

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