Advent of Code 2018

Codes from Christmas coding event.

Useful functionalities:

• Array.prototype.sum - day 1

• test for counting characters in a string - speed testing

• String.prototype.countChar (winner of speed testing) - speed testing

• String.prototype.setCharAt - day 3, day 4

• Array.prototype.countChar - day 3, day 4, day 6

• String.prototype.isLower (isupper in Python) - day 5

• String.prototype.isUpper (islower in Python) - day 5

• String.prototype.react (delete two characters from a string) - day 5

• String.prototype.dispose (delete one character from a string) - day 5

• ord, chr (same as in Python and PHP) - day 6

• countManhattan (counts Manhattan distance) - day 6 and much more in day 23

• Array.from({length:players}).map(x => 0) (creating array of zeroes) - day 9

• Array.prototype.intersection (intersection of arrays) - day 16

• different sorting functions - day 24