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CodeCraft Juniors
Web Development · Day 32 of 40

JavaScript Functions

Create reusable functions with parameters and return values.

60 minutesLive + guided practiceBeginner friendly
01 · LEARNING TARGETS

What students should understand today

  • Function DeclarationsUnderstand what it means, where it is used and practise it in a small example.
  • ParametersUnderstand what it means, where it is used and practise it in a small example.
  • Return ValuesUnderstand what it means, where it is used and practise it in a small example.
  • ReusabilityUnderstand what it means, where it is used and practise it in a small example.
02 · TEACHING NOTES

Core lesson

Start with the idea, not the syntax. Create reusable functions with parameters and return values. The instructor should connect the topic to something students already understand, then introduce the exact terms they need for today.

Build in small steps. The teacher demonstrates one clean pattern, then students recreate it with their own content and styling so they understand the structure rather than copying blindly. Pause after each important change and ask students to predict what will happen before running or refreshing the result.

Develop good habits. Students should keep the browser and code editor open side-by-side, save often and refresh after each small change. Keep naming, indentation/structure and output clear enough that another student could follow the work.

03 · LIVE BUILD

Write functions for greeting, total price and percentage calculations.

1

Plan the result first: decide what the user/student should see or be able to do at the end.

2

Build the smallest working version using today’s main concepts and test it immediately.

3

Add one improvement at a time and ask students to explain why each line/element is needed.

4

Test with at least two different inputs, screen sizes or scenarios and fix one issue together.

04 · STUDENT CHALLENGE

Independent practice

Move repeated code into functions and call them with different values.

Teacher rule: give hints in steps, but avoid typing the complete answer for the student. The goal is to make them think, try and correct.
05 · END-OF-DAY CHECK

Before moving to the next day

  • I can explain function declarations in simple words.
  • I can explain parameters in simple words.
  • I can explain return values in simple words.
  • I can complete today’s mini task with only small hints.
Optional 10–15 minute home practice

Rebuild today’s example once without looking at the finished version. Change the names, values, text or design so the result is clearly your own.

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