Lesson 1 of 3 · 8 min

Variables & values

let creates a changeable variable, const creates one that stays fixed: const name = "Ada".

JavaScript has strings, numbers, booleans, arrays and objects as its everyday building blocks.

Practice

Create a const for your favorite number and a let for a counter, then increase the counter.

Optional resources

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Run your first JavaScript snippets in a browser workspace.

Free and paid plans; usage limits and feature availability vary.

Look up JavaScript and DOM references while you practice.

Free documentation.