BananaMaster

45.1 - Taxi Fare Calculator, practice (JS lessons — arguments and return)

If you forgot something — click to go to the lesson.

📘 Task: Taxi Fare Calculator

Create the "Taxi Fare Calculator" app.

The user enters the trip distance in km and the trip time in minutes, and also marks whether the trip was at night (after 22:00). After clicking the button, the final fare needs to be calculated.

🧩 Main condition: architecture of 4 functions

All the logic needs to be split into exactly 4 functions:

• 3 calculator functions — each is responsible for its own part of the calculation (distance, time, night surcharge).
• 1 main function — doesn't calculate anything directly itself. It calls all three calculator functions inside itself, passes them the needed arguments, and uses what they returned.

💰 Rates (hardcoded as constants):

• 🚕 Base fee — 20 $
• 📏 Price per 1 km — 5 $
• ⏱️ Price per 1 minute — 0.5 $
• 🌙 Night surcharge (if the trip is at night) — +20% of the final amount

📐 Functions you need to write:

• Function 1 — distance:
  calculateDistanceCost, returns the distance cost: distanceKm * 5
• Function 2 — time:
  calculateTimeCost, returns the time cost: minutes * 0.5
• Function 3 — night surcharge:
  calculateNightSurcharge(amount) — takes only the amount. Inside the function itself, create a variable that stores the "night" flag (for example let isNight = true; or false). If isNight === true — returns amount * 1.2, otherwise — returns amount unchanged.
• Function 4 — main:
  calculateTotalFare() — all the other functions are called inside it. The final result needs to be displayed on the screen.
• Print the answer in this format:
  "Total fare: 96 $"