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Arrays, objects, data transformations

Represent study sessions as arrays of objects and transform them into summaries.

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.

OrientStep 1 of 12

What collections changes

OrientStep 1 of 12

Get your bearings before the details.

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