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Functions, parameters, return values, scope

Package repeatable behavior in functions and return values without leaking local names.

35 min6 exercisescontent 2026.08.javascript-foundations.v1

Demonstration state · Demo curriculum state: available. Presentation states are seeded demonstration data and are not authoritative learner progress.

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What functions and lexical scope changes

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Get your bearings before the details.

What functions and lexical scope changes

This lesson uses functions and lexical scope to make a small console program clearer. Read each line, predict its output, then make one deliberate change.

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What functions and lexical scope changes

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