Week 4 — Functions & Git 🧩

You'll write four short JavaScript functions and push your work to GitHub. The functions are tiny on purpose — the real win this week is getting comfortable with defining functions, returning values, and the Git workflow.

Setup

1. Fork this repo to your own GitHub account (button top-right).
2. Clone your fork to your computer:

   git clone https://github.com/YOUR-USERNAME/Week4_Functions.git
   cd Week4_Functions

3. Open the folder in your code editor.
4. Open index.html in your browser. Open the browser console (F12 → Console).
5. Edit challenges.js. Refresh the page to see new output.

Tasks

Task 1 — Greet User 👋

Write a function greetUser(name) that returns a greeting string.

greetUser("Fatuma");  // → "Hello, Fatuma!"
greetUser("Asha");    // → "Hello, Asha!"

📝 The function should return the string, not log it. The test code at the bottom of the file will log the result.

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Task 2 — Tip Calculator 💵

Write a function calculateTip(bill, tipPercent) that returns the tip amount.

calculateTip(50, 20);   // → 10
calculateTip(80, 15);   // → 12

Formula: bill * (tipPercent / 100)

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Task 3 — Celsius to Fahrenheit 🌡️

Write a function celsiusToFahrenheit(c) that returns the temperature in °F.

celsiusToFahrenheit(0);    // → 32
celsiusToFahrenheit(100);  // → 212
celsiusToFahrenheit(25);   // → 77

Formula: (c * 9) / 5 + 32

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Task 4 — Is Adult? 🎂

Write a function isAdult(age) that returns true if the age is 18 or older, otherwise false.

isAdult(20);  // → true
isAdult(15);  // → false
isAdult(18);  // → true

💡 Try writing this one as an arrow function: const isAdult = (age) => ...

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✅ When you're done

• All 4 functions exist with the exact names listed above
• Each function uses return (not just console.log)
• Running index.html in the browser shows the right values in the console

Submitting (Git workflow)

git add .
git commit -m "Complete Week 4 functions assignment"
git push

Then submit the link to your repo (something like https://github.com/your-name/Week4_Functions).

🚀 Stretch (optional)

Add one more function: getInitials(firstName, lastName) → returns the initials, like "Fatuma", "Ali" → "F.A."