These problems will use your knowledge of looping and conditionals, and we will build functions on top of that.
- Fork and clone this repository
- Solve the problems below in separate files, located in
js
- Run
node js/nameOfFile.js
to execute code
##Problems
###letterCount(word)
Write a function that takes a string that finds out how many times a character occurs. For example, the string "apple" would print the following:
a - 1
p - 2
l - 1
e - 1
Hint: Loop through each letter, and increment the value to a key in an object. The key should be that object.
BONUS: Make sure that lower case letters and upper case letters count for the same character. Also, ignore spaces and punctuation.
###sillySum(arr) Write a function that takes an array of numbers, and returns the sum of each number multiplied by its index.
count += (number * index)
###isPrime(num)
Create a function to return true
or false
if a number passed in a prime number.
###primes(max)
Using your isPrime()
function, create a function primes
that will return an array of all prime numbers up to a certain amount.
###numSquare(max)
Create a function called numSquare
that will return an array of all perfect square numbers up to, but not exceeding a max number.
##BONUS
###merge(arr1, arr2)
Write a function called merge
. The function should take two sorted arrays of numbers as input and return a merged array of the sorted numbers from the input. For example, if the input arrays were var arr1 = [3,6,11]; var arr2 = [2,4,5,8,9];
Then the returned array would be: [2,3,4,5,6,8,9,11]
.
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