edmundtck / js-functions

[javascript, problem-solving]

Functions - Problem Set

These problems will use your knowledge of looping and conditionals, and we will build functions on top of that.

Getting Started

• Fork and clone this repository
• Solve the problems below in separate files, located in js
• Run node js/nameOfFile.js to execute code

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Problems

maxOfThree(num1, num2, num3)

Define a function maxOfThree that takes three numbers as arguments and returns the largest of them. Use the if-then-else construct available in Javascript.

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isCharacterAVowel(num)

Write a function isCharacterAVowel that takes a character (i.e. a string of length 1) and returns true if it is a vowel and false, otherwise.

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sumArray(arr)

Define a function sumArray and a function multiplyArray that sums and multiplies (respectively) all the numbers in an array of numbers. For example, sumArray([1,2,3,4]) should return 10, and multiplyArray([1,2,3,4]) should return 24.

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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)

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reverseString(num)

Define a function reverseString that reverses a string. For example, reverseString("jag testar") should return the string "ratset gaj".

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findLongestWord(arr)

Write a function findLongestWord that takes an array of words and returns the length of the longest word in the array.

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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.

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isPrime(num)

Create a function to return true or false if a number passed in a prime number.

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primes(max)

Using your isPrime() function, create a function primes that will return an array of all prime numbers up to a certain amount.

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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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Licensing

1. All content is licensed under a CC-BY-NC-SA 4.0 license.
2. All software code is licensed under GNU GPLv3. For commercial use or alternative licensing, please contact [email protected].