1. Round Up Prices
- Given an array of prices:
[12.1, 5.3, 8.9] - Return a new array with each price rounded up to the nearest whole number
Example Output:
[13, 6, 9]
Code
let numbers = [12.1, 5.3, 8.9];
for(let i = 0; i < numbers.length; i++) {
numbers[i] = Math.round(numbers[i]);
}
console.log(numbers);
2. Round Down Student Scores
Given scores: [87.6, 92.4, 78.9, 65.3]
Return scores rounded down to whole numbers.
Example Output:
[87, 92, 78, 65]
Code
let numbers = [87.6, 92.4, 78.9, 65.3]
for(let i = 0; i < numbers.length; i++) {
numbers[i] = Math.floor(numbers[i]);
}
console.log(numbers);
3. Round to Nearest Rating
Ratings: [4.5, 3.2, 4.8, 2.4]
Round each rating to the nearest whole number.
Example Output:
[5, 3, 5, 2]
Code
let numbers = [4.5, 3.2, 4.8, 2.4]
for(let i = 0; i < numbers.length; i++) {
numbers[i] = Math.round(numbers[i]);
}
console.log(numbers);
4. Total Income (Ignoring Decimals)
Monthly incomes: [1200.50, 899.99, 1500.20]
Calculate total income by ignoring decimal parts.
Example Output:
3599 (1200 + 899 + 1500)
Code
let numbers = [1200.50, 899.99, 1500.20]
let sum = 0
for(let i = 0; i < numbers.length; i++) {
sum += Math.floor(numbers[i]);
}
console.log(sum);
5. Dice Roll Simulator
Write a function that returns a random number between 1 and 6 inclusive, simulating a dice roll.
Code
console.log(Math.floor(Math.random() * 6 + 1));
6. Sum Integer Parts Only
Numbers: [1.5, 87.5, 47.8]
Sum only the integer parts, ignoring decimals.
Example Output:
135 (1 + 87 + 47)
Code
let numbers = [1.5, 87.5, 47.8]
let sum = 0
for(let i = 0; i < numbers.length; i++) {
sum += Math.floor(numbers[i]);
}
console.log(sum); // Output: 135
7. Highest and Lowest Temperature
Temperatures: [21.3, 29.4, 19.7, 25.5, 31.2]
Return both the highest and lowest temperature.
Example Output:
Highest: 31.2, Lowest: 19.7
Code
let numbers = [21.3, 29.4, 19.7, 25.5, 31.2]
console.log('Lowest Temperature :-', Math.min(...numbers)); // Output: 19.7
console.log('Highest Temperature :-', Math.max(...numbers)); // Output: 31.2
8. Apply Discount and Round
Prices: [100, 200, 150]
Apply a 20% discount and round final prices to nearest whole number.
Example Output:
[80, 160, 120]
9. Absolute Difference Function
Create a function that takes two numbers and returns their absolute difference.
Example:
difference(10, 15) ➞ 5
10. Square Roots of Numbers
Numbers: [4, 9, 16, 25]
Return an array of their square roots.
Example Output:
[2, 3, 4, 5]
Code
let numbers = [4, 9, 16, 25]
let squareRoots = numbers.map(Math.sqrt)
console.log(squareRoots) // Output: [2, 3, 4, 5]
11. Power Function
Write a function that takes base and exponent and returns base raised to exponent.
Example:
power(2, 3) ➞ 8
Code
function power(base, exponent) {
return Math.pow(base, exponent);
}
console.log(power(2, 3)); // 8
12. Pick Random Character
Characters: ["a", "b", "c", "d", "e"]
Return a random character from the array.
13. Round Up Weights
Weights: [2.45, 1.75, 3.6, 2.9]
Round each weight up to the nearest whole number.
Example Output:
[3, 2, 4, 3]
14. Simulate 100 Coin Tosses
Simulate tossing a coin 100 times. Count how many times you get heads and tails.
15. Total User Scores (Ignore Decimals)
Scores: [23.6, 25.9, 24.1, 22.8]
Sum integer parts only.
Example Output:
94
16. Calculate Areas of Circles
Radii: [3, 5, 7]
Return an array of areas (πr²) rounded to 2 decimals.
Example Output:
[28.27, 78.54, 153.94]`
17. Generate Random Password
Characters: ["a", "b", "c", "d", "e", "1", "2", "3"]
Generate a 5-character random password.
18. Difference Between Max and Min
Numbers: [10, 25, 7, 30, 18]
Return the difference between max and min numbers.
Example Output:
23
19. Round Down Ages
Ages: [18.9, 21.5, 16.7, 25.3]
Return array with ages rounded down.
Example Output: [18, 21, 16, 25]
20. Cube of Numbers
Numbers: [2, 3, 4]
Return their cubes.
Example Output: [8, 27, 64]
💡 Pro Tip
Try to solve these problems using JavaScript’s built-in Math methods such as:
Math.ceil(), Math.floor(), Math.round(), Math.trunc(), Math.random(), Math.max(), Math.min(), Math.pow(), Math.sqrt(), Math.abs(), and Math.PI.
Ready to level up your JavaScript math skills?
Start coding now and watch your confidence grow! 💻🔥
Feel free to share your solutions or ask questions in the comments!
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