JavaScript Challenges

The Foundations

1. Suuq Receipt

Faadumo runs a small shop. A customer buys rice for $12 and chicken for $18. Tax is 10%.

Calculate the full receipt:

• Subtotal, tax amount, and total
• Each on its own line

Example Output:

Rice: $12
Chicken: $18
Subtotal: $30
Tax (10%): $3
Total: $33

2. Salary

Bile worked 80 hours this month. His rate is 175 NOK per hour. Tax is 22%.

Calculate his earnings:

• Gross pay, tax, and net pay
• Each on its own line

Example Output:

Gross pay: 14000 NOK
Tax: 3080 NOK
Net pay: 10920 NOK

3. Student Profile

Hodan just signed up for Bashi Academy. She is 22, lives in Oslo, and enrolled in JavaScript. She has paid. The course price never changes.

Store her full profile and print every detail:

• All six details
• Price cannot be reassigned

Example Output:

Name: Hodan
Age: 22
City: Oslo
Course: JavaScript
Paid: true
Price: $9.99

4. Data Inspector

A user just filled out a form. Before saving to the database you need to know the type of each value. Username: "Yusuf", age: 25, verified: true, score: null, phone: not filled yet.

Print each value with its type:

• Five values
• Value and type on each line

Example Output:

Yusuf - string
25 - number
true - boolean
null - object
undefined - undefined

5. Flight Budget

Nimo wants to fly to Mogadishu. The ticket costs $620. Airport tax is $45. She has $950 saved.

Check if she can afford the trip:

• Total trip cost
• Whether she can afford it
• How much she has left or how much more she needs

Example Output:

Total cost: $665
She can afford it
Remaining: $285

6. Parking Fee

Yusuf parked in Oslo for 4 hours. The garage charges 50 NOK for 1 hour or less, 100 NOK up to 3 hours, and 200 NOK after that.

Calculate what he pays:

• Hours parked
• Final fee based on the rules

Example Output:

Hours parked: 4
Parking fee: 200 NOK

7. Xawaala Transfer

Ahmed is in Oslo sending $500 home. The exchange rate is 10 NOK per dollar. The fee is 4.5%.

Calculate what leaves his account:

• Amount in NOK
• Fee in NOK
• Total charged in NOK
• How much arrives in dollars

Example Output:

Amount: 5000 NOK
Fee: 225 NOK
Total charged: 5225 NOK
Arrives: $500

8. Cinema Ticket

Ahmed is buying a cinema ticket in Oslo. He is 14 years old. The cinema charges 80 NOK for under 12, 100 NOK for 12 to 17, 130 NOK for 18 to 64, and 90 NOK for 65 and over.

Print the right ticket price:

• Age
• Price based on the rules

Example Output:

Age: 14
Ticket price: 100 NOK

9. Grocery Run

Sahra goes to the supermarket with 500 NOK. She buys rice 85 NOK, chicken 120 NOK, bread 35 NOK, and milk 25 NOK.

Check if she has enough:

• Total cost
• Budget
• Change

Example Output:

Total: 265 NOK
Budget: 500 NOK
Change: 235 NOK

10. Loan Eligibility

A bank approves loans based on three conditions: age at least 21, monthly income above 15000 NOK, and no existing debt. Applicant: age 24, income 18000 NOK, no debt.

Check all three conditions:

• Print approved or which condition failed

Example Output:

Loan approved

11. Phone Plan

Amina is choosing a phone plan. Under 100 NOK: calls only. 100 to 300 NOK: calls and data. Above 300 NOK: calls, data, and streaming. She pays 250 NOK per month.

Print the right plan:

• Monthly cost
• What is included

Example Output:

Monthly cost: 250 NOK
Includes: calls and data

12. Delivery Fee

Hodan orders food online. The order is 320 NOK. Delivery is free above 250 NOK. Below that it costs 49 NOK.

Check if she gets free delivery:

• Order amount
• Delivery fee

Example Output:

Order: 320 NOK
Delivery: free

13. Gym Membership

Mahad wants to join a gym. Monthly fee is 399 NOK. He has 1200 NOK saved. He wants to know how many months he can afford and how much he has left.

Calculate his membership:

• Months he can afford
• Remaining balance

Example Output:

Months: 3
Remaining: 3 NOK

14. Speed Check

Faarax is driving on a Norwegian highway. The speed limit is 90 km/h. He is driving at 112 km/h. The fine is 800 NOK for every 10 km/h over the limit.

Calculate the fine:

• How much over the limit
• Total fine

Example Output:

Over limit by: 22 km/h
Fine: 1600 NOK

15. Course Progress

Abdullahi has completed 7 out of 18 lessons in the JavaScript course. Calculate his progress and print whether he is less than halfway, exactly halfway, or more than halfway.

Check his progress:

• Percentage completed
• Progress status

Example Output:

Progress: 38%
Status: less than halfway

The Mechanics

16. Welcome Message

Yusuf builds a shop website. Every visitor gets a welcome message with their name.

Write the function and call it:

• A function that takes a name and prints a welcome message
• Call it with three different names

Example Output:

Welcome, Ahmed!
Welcome, Faadumo!
Welcome, Nimo!

17. Currency Converter

Sahra needs to convert dollars to NOK. The rate is 10.

Write the function and test it:

• A function that takes a dollar amount and returns the NOK value
• Call it with 50, 200, and 500

Example Output:

$50 = 500 NOK
$200 = 2000 NOK
$500 = 5000 NOK

18. Grade Report

Ahmed wants to know his letter grade. Score 90+ is A, 80-89 is B, 70-79 is C, 60-69 is D, below 60 is F.

Write the function and test it:

• A function that takes a name and score and returns a full report
• Call it with three students: Ahmed 85, Faadumo 92, Yusuf 54

Example Output:

Ahmed: 85 - B
Faadumo: 92 - A
Yusuf: 54 - F

19. Discount Calculator

A shop gives different discounts based on membership. Gold: 20%, Silver: 10%, Basic: 5%.

Write the function and test it:

• A function that takes a price and membership level and returns the final price
• Call it with price 300 for each level

Example Output:

Gold: 240 NOK
Silver: 270 NOK
Basic: 285 NOK

20. Contact List

Nimo has four contacts: "Ahmed", "Faadumo", "Yusuf", "Bile".

Store and read the list:

• Store all four in an array
• Print the first and last contact
• Print the total number of contacts

Example Output:

First: Ahmed
Last: Bile
Total: 4

21. Waiting List

A clinic has a waiting list: ["Hodan", "Mahad", "Sahra", "Bile", "Nimo"]. Hodan is called in. A new patient "Yusuf" arrives and gets priority.

Update the list:

• Remove the first person
• Add Yusuf to the front
• Print the updated list and its length

Example Output:

["Yusuf", "Mahad", "Sahra", "Bile", "Nimo"]
Length: 5

22. Cart Manager

Faadumo is shopping online. Her cart has ["rice", "eggs", "bread"]. She adds "chicken". She decides she does not need "eggs". Check if "bread" is still in the cart.

Update the cart:

• Add chicken to the end
• Remove eggs by position
• Check if bread is in the cart
• Print the final cart

Example Output:

["rice", "bread", "chicken"]
bread in cart: true

23. Weekly Sales

A shop recorded daily sales: [1200, 980, 1450, 760, 1100, 890, 1300].

Calculate the results:

• Total sales for the week
• Average daily sales

Example Output:

Total: 7680 NOK
Average: 1097 NOK

24. Passing Students

Ten students took an exam: [88, 45, 72, 91, 55, 68, 79, 43, 95, 61]. Passing score is 60.

Loop through and count:

• How many passed
• How many failed

Example Output:

Passed: 7
Failed: 3

25. Price Filter

A shop has these prices: [299, 149, 499, 89, 349, 199]. Everything above 200 NOK gets a 20% discount.

Loop through and print:

• Original price and discounted price for qualifying items
• Original price for items that do not qualify

Example Output:

299 -> 239 NOK
149 -> no discount
499 -> 399 NOK
89 -> no discount
349 -> 279 NOK
199 -> no discount

26. Student Profile

Bile just enrolled. Name: "Bile", age: 19, city: "Hargeisa", course: "JavaScript", paid: true.

Store and update his profile:

• Store all five values in an object
• He moves to Oslo — update his city
• Print every detail

Example Output:

Name: Bile
Age: 19
City: Oslo
Course: JavaScript
Paid: true

27. Product Stock

A shop has a laptop in stock. Name: "Laptop", price: 8999 NOK, stock: 5. A customer buys 2.

Update and check the stock:

• Update the stock after the purchase
• Check if stock is still available
• Print the result

Example Output:

Remaining stock: 3
Status: In stock

28. Class Results

Five students submitted their scores. Ahmed 85, Faadumo 62, Yusuf 91, Nimo 47, Bile 78. Passing score is 60.

Loop through and report:

• Each student with pass or fail
• Total number of students who passed

Example Output:

Ahmed: Pass
Faadumo: Pass
Yusuf: Pass
Nimo: Fail
Bile: Pass
Passed: 4

29. Transaction History

Five customers sent money. Ahmed $200, Faadumo $450, Yusuf $120, Nimo $890, Bile $340.

Loop through and calculate:

• Print each transaction
• Total amount sent
• Largest transaction

Example Output:

Ahmed: $200
Faadumo: $450
Yusuf: $120
Nimo: $890
Bile: $340
Total: $2000
Largest: Nimo - $890

30. Leaderboard

Five players finished a game. Mohamed 1200, Sagal 950, Ali 1500, Nimo 880, Hassan 1340.

Build the leaderboard:

• Print all players with their points
• Find the winner
• Calculate the average score
• Print how many players are above average

Example Output:

Mohamed: 1200
Sagal: 950
Ali: 1500
Nimo: 880
Hassan: 1340
Winner: Ali with 1500 points
Average: 1174 points
Above average: 3 players

The Transformations

31. Transfer Check

Ahmed wants to send $800. His balance is $750.

Use one line to print the result:

• Approved or declined based on his balance

Example Output:

Transfer declined

32. Membership Status

Hodan has 1200 points. Premium requires 1000 points.

Use one line to print her status:

Example Output:

Premium member

33. Order Details

An order comes in from the system.

let order = { customer: "Faadumo", amount: 450, city: "Oslo", status: "pending" };

Print all four values on separate lines without using dot notation:

Example Output:

Faadumo
450
Oslo
pending

34. Student Card

A student profile arrives from the database.

let student = { name: "Yusuf", age: 21, course: "JavaScript", paid: true };

Print a formatted student card in one line without using dot notation:

Example Output:

Yusuf, 21 — JavaScript — Paid: true

35. Top Three

The final scores are in.

let scores = [95, 88, 76, 61, 45];

Print first place, second place, and the rest without using index notation:

Example Output:

1st: 95
2nd: 88
Rest: [76, 61, 45]

36. Cities

A user has lived in multiple cities.

let cities = ["Mogadishu", "Nairobi", "Oslo", "London"];

Print the first city and all remaining cities without using index notation:

Example Output:

Born in: Mogadishu
Also lived in: ["Nairobi", "Oslo", "London"]

37. Fee Calculator

Write a single-line function called calcFee that takes an amount and returns 4.5% of it.

Call it with 500, 1000, and 2000:

Example Output:

22.5
45
90

38. Full Name

Write a single-line function called fullName that takes a first and last name and returns them combined.

Call it with three names:

Example Output:

Ahmed Maxamed
Faadumo Warsame
Yusuf Ali

39. Process Payment

Write a function called processPayment that takes an amount and a callback. It prints "Processing..." then calls the callback with the amount.

Call it with a function that prints the confirmation:

Example Output:

Processing...
Payment of 500 NOK confirmed

40. Notify User

Write a function called sendNotification that takes a username and a callback. Call it with "Ahmed" and a function that prints a welcome notification.

Example Output:

Notification sent to Ahmed
Welcome to Bashi Academy, Ahmed!

41. Class Roster

let students = ["Ahmed", "Faadumo", "Yusuf", "Nimo", "Bile"];

Print each student with their number. Do not use a for loop:

Example Output:

1. Ahmed
2. Faadumo
3. Yusuf
4. Nimo
5. Bile

42. Sale Prices

A shop is running a 20% sale.

let prices = [100, 250, 80, 400, 150];

Return a new array with all prices discounted. Do not use a for loop:

Example Output:

[80, 200, 64, 320, 120]

43. Score Board

let students = [
  { name: "Ahmed", score: 85 },
  { name: "Faadumo", score: 72 },
  { name: "Yusuf", score: 91 },
  { name: "Nimo", score: 55 }
];

Return a new array of formatted strings. Do not use a for loop:

Example Output:

["Ahmed: 85", "Faadumo: 72", "Yusuf: 91", "Nimo: 55"]

44. High Earners

let salaries = [18000, 42000, 31000, 55000, 22000, 48000];

Return only salaries above 35000 NOK. Do not use a for loop:

Example Output:

[42000, 55000, 48000]

45. Oslo Students

let students = [
  { name: "Ahmed", city: "Oslo" },
  { name: "Faadumo", city: "Mogadishu" },
  { name: "Yusuf", city: "Oslo" },
  { name: "Nimo", city: "Hargeisa" },
  { name: "Bile", city: "Oslo" }
];

Return only students in Oslo and print their names. Do not use a for loop:

Example Output:

Ahmed
Yusuf
Bile

46. Order Lookup

You know filter and find. Use both here — not a loop.

let orders = [
  { id: 101, customer: "Sahra", status: "pending" },
  { id: 102, customer: "Mahad", status: "delivered" },
  { id: 103, customer: "Hodan", status: "pending" }
];

Find all pending orders. Then find the first delivered one. Print both results:

Example Output:

Pending: Sahra, Hodan
First delivered: Mahad

47. Failed and Passed

Two calls to filter is all you need. No loops, no if statements outside of the callback.

let students = [
  { name: "Ahmed", score: 85 },
  { name: "Faadumo", score: 45 },
  { name: "Yusuf", score: 91 },
  { name: "Nimo", score: 38 }
];

Separate students into passed and failed. Print both groups and the count of each:

Example Output:

Passed: Ahmed, Yusuf (2)
Failed: Faadumo, Nimo (2)

48. Ranked Leaderboard

Sort first, then use forEach to print. Calculate the average before you loop.

let players = [
  { name: "Mohamed", points: 1200 },
  { name: "Sagal", points: 950 },
  { name: "Ali", points: 1500 },
  { name: "Nimo", points: 880 }
];

Sort by points highest to lowest. Print each player with their rank, points, and whether they are above the average:

Example Output:

1. Ali — 1500 — above average
2. Mohamed — 1200 — above average
3. Sagal — 950 — below average
4. Nimo — 880 — below average

49. City Report

Sort first, then use map to add numbers. Do not use a for loop anywhere.

let cities = ["Oslo", "Mogadishu", "Hargeisa", "Nairobi", "London"];

Sort alphabetically. Add a number to each city. Print the numbered list and the total count:

Example Output:

1. Hargeisa
2. London
3. Mogadishu
4. Nairobi
5. Oslo
Total: 5 cities

50. Full Pipeline

Three methods chained together. No for loop anywhere.

let students = [
  { name: "Ahmed", score: 85 },
  { name: "Faadumo", score: 45 },
  { name: "Yusuf", score: 91 },
  { name: "Nimo", score: 38 },
  { name: "Bile", score: 72 }
];

In one chain:

• Keep only students who passed (60 or above)
• Sort them from highest to lowest
• Print each with their rank and score

Example Output:

1. Yusuf — 91
2. Ahmed — 85
3. Bile — 72