Functions Exercises

Before you begin

Fork and clone this repo to your computer
Open vs-code. In the terminal ctrl + j type npm i and press enter
Add a file named .gitignore and type in this: node_modules
Now the node_modules folder should be greyd out

Congratulations 🎉

You are ready to begin!

Write your code in the file Exercise.js in the pre-made functions.

Commit after each question you solve
Do not change any function's name
Do not delete any other piece of code, only add yours
Do not edit any of the other files
Uncomment line 3 if you solved the bonus question

How to run tests?

You can test your code on your own in the Exercise.js file.

But, to pass the task you should also pass the automated tests. You should have 6/6 (you start with 1/6 because of the bonus)

To run the tests type npm test and press enter.

The Questions

Question 1

Write a JavaScript function that reverse a string.

Example x = "Cyber4s;

Expected Output : s4rebyC

Question 2

Write a JavaScript function that generates all combinations of a string.

Example string : 'dog'

Expected Output : d,do,dog,o,og,g

Question 3

Write a JavaScript function that accepts a string as a parameter and converts the first letter of each word of the string in upper case.

Example string : 'the quick brown fox'

Expected Output : 'The Quick Brown Fox '

Question 4

Write a JavaScript function to compute the value of x^n where n is the exponent and x is the bases.

Question 5

Write a JavaScript function to find the first not repeated character.

Sample arguments : 'abacddbec'

Expected output : 'e'

Question 6 - Bonus

Write a JavaScript function which says whether a number is perfect.

According to Wikipedia : In number theory, a perfect number is a positive integer that is equal to the sum of its proper

positive divisors, that is, the sum of its positive divisors excluding the number itself (also known as its aliquot sum.

Equivalently, a perfect number is a number that is half the sum of all of its positive divisors (including itself).

Example : The first perfect number is 6, because 1, 2, and 3 are its proper positive divisors, and 1 + 2 + 3 = 6.

Equivalently, the number 6 is equal to half the sum of all its positive divisors: ( 1 + 2 + 3 + 6 ) / 2 = 6. The next

perfect number is 28 = 1 + 2 + 4 + 7 + 14. This is followed by the perfect numbers 496 and 8128.

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