Write a function printNumbers which is given a start number and an end number. It will print the numbers from one to the other, one per line:

printNumbers(1, 10);

1
2
3
4
5
6
7
8
9
10

Write two versions of the above function. One using a while loop and the other using a for loop.

Write a function printSquare which is given a size and prints a square of that size using asterisks.

printSquare(5);

*****
*****
*****
*****
*****

Write function printBox which is given a width and height and prints a hollow box of those given dimensions.

printBox(6, 4);

******
*    *
*    *
******

Write a function printBanner which is given some text and prints a banner with a border surrounding the text. The border has to stretch to the length of the text.

printBanner('Welcome to DigitalCrafts');

****************************
* Welcome to DigitalCrafts *
****************************

Write a function factors which is given a number and returns an array containing all its factors. What are factors? https://www.khanacademy.org/math/pre-algebra/factors-multiples/divisibility-and-factors/v/finding-factors-of-a-number

Write a function cipher which is given a string, an offset, and returns the Caesar cipher of the string.

cipher('Genius without education is like silver in the mine', 13);

'Travhf jvgubhg rqhpngvba vf yvxr fvyire va gur zvar'

Write a function decipher which is given a string, an offset, and returns the original message.

decipher('Travhf jvgubhg rqhpngvba vf yvxr fvyire va gur zvar', 13);

'Genius without education is like silver in the mine'

Write a function leetspeak which is given a string, and returns the leetspeak equivalent of the string. To convert text to its leetspeak version, make the following substitutions:

A => 4 E => 3 G => 6 I => 1 O => 0 S => 5 T => 7

leetspeak('Leet');

l337

Write a function, which is given a string, return the result of extending any long vowels to the length of 5.

longLongVowels('Good');

'Goooood'

longLongVowels('Cheese');

'Cheeeeese'

longLongVowels('Man');

'Man'

Write a function sumNumbers which is given an array of numbers and returns the sum of the numbers.

sumNumbers([1, 4, 8]);

13

Write a function positiveNumbers which is given an array of numbers and returns a new array containing only the positive numbers within the given array.

positiveNumbers([1, -3, 5, -3, 0]);

[1, 5, 0]

positiveNumbers([1, 2, 3]);

[1, 2, 3]

positiveNumbers([-1, -2, -3]);

[]

Write a function matrixAdd which is given two two-dimensional arrays, and returns a new two-dimensional array containing their matrix sum.

> matrixAdd([[[1, 3], [2, 4]], [[5, 2], [1, 0]]])

[ [ 6, 5 ], [ 3, 4 ] ]

Write a function matrixMultiply which is given two two-dimensional arrays - you can assume the matricies are of size 2x2. It will return the result of matrix multiplication between the two given matricies.

https://www.khanacademy.org/math/precalculus/precalc-matrices/multiplying-matrices-by-matrices/v/matrix-multiplication-intro

matrixMultiply(
  [
    [2, 4],
    [3, 4],
  ],
  [
    [5, 2],
    [3, 1],
  ]
);

[ [22,  8], [27, 10] ]

Write a function rockPaperScissors which takes the throw of player 1 and the throw of player 2. A throw can have the values of 'rock', 'paper', or 'scissors'. It will return 'player 1' if player 1 wins, 'player 2' if player 2 wins, and 'draw' if there is no winner.

rockPaperScissors('rock', 'scissors');

'player 1'

rockPaperScissors('rock', 'paper');

'player 2'

rockPaperScissors('paper', 'paper');

'draw'

Write a function ticTacToe which takes a two-dimensional array of size 3x3. Each cell in the two dimensional array can be one of 'O', 'X', or null. The ticTacToe function will determine the winner by

returning 'O' if O makes a row returning 'X' if X makes a row return null if neither makes a row

ticTacToe([
  ['O', 'O', 'O'],
  ['X', null, 'X'],
  [null, 'X', null],
]);

'O'

ticTacToe([
  ['O', 'X', 'O'],
  ['O', 'X', null],
  [null, 'X', null],
]);

'X'

ticTacToe([
  ['O', 'X', 'O'],
  ['O', 'O', null],
  [null, 'X', 'X'],
]);

null