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Coding · Grade 7

JavaScript and Interactive Events

Learners read JavaScript by comparing it with Python, then learn how event-driven programs wait for clicks and key presses and respond with handler functions. Using a small event simulator, they trace how handlers change program state, and they debug the classic event bugs: calling instead of passing a handler, = instead of ===, resetting state inside a handler and forgetting to render.

  • 4 lessons
  • About 85 minutes
  • Check what you learned: 8 questions
  • Ways to answer: fill in the blanks, choose an answer, put code in order, trace code, highlight a text and match pairs
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What learners will discover

  • Read JavaScript syntax (let, const, console.log, braces, ===, for loops) and relate it to Python.
  • Explain event-driven programs: events, handlers, registering a handler and the order events arrive.
  • Trace how handlers update state variables and the display as a sequence of events happens.
  • Find and fix common event bugs in JavaScript programs.

Lessons

  1. Meet JavaScript 6 steps3 practiceabout 20 min
  2. Events and handlers 5 steps3 practiceabout 20 min
  3. Handlers change state 5 steps3 practiceabout 22 min
  4. Debugging interactive programs 5 steps3 practiceabout 18 min
  5. Check what you learned 8 questions at the end

Keep exploring

Games to practice with

  • Bug DetectiveA robot program almost works. Run it, spot the buggy block, and fix it.
  • Sorting FactoryTurn a work order into if/else rules and watch the conveyor sort every item.
  • Garden AutomationProgram a garden robot with sensor rules — then watch a whole day play out.

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