Closures Mini-Workshop (Student Repo)

Duration: 90 minutes (in-workshop exercises)
Focus: Using closures to persist state across calls, guided by APS (Approach to Problem Solving).

Problems

You will work through three problems in problems/:

1. addByX.js (APS review)
2. callTimes.js (pairs)
3. saveOutput.js (trios)

Each file contains:

• A student-facing prompt at the top
• A starter function
• An optional runTests() function that you can uncomment locally

Tip: Use the APS steps as you work (Define success → Explore key phrases → Match actions → Redefine if needed → Create strategy).

Getting Started

1. Codespaces or local: open the repo in VS Code.
2. Open a problem file in problems/.
3. Fill in the function body.
4. Uncomment the runTests() call at the bottom to try your solution.

Stretch Ideas

• Combine adders from addByX: Write a function that takes two addByX functions (like addByTwo and addByThree) and returns a new function that adds both amounts.
• Make callTimes resettable: Add functionality to reset the counter back to zero.
• Extend saveOutput: Support functions that take multiple arguments.

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Workshop Expectation: For each problem, run the minimal examples provided, then add ONE of your own test call(s) to validate your solution (edge case or independent instance). Keep it short — you have ~20 minutes per challenge.