Advent of Code 2015
Codes from Christmas coding event.
Useful functionalities:
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String.prototype.isNumber (is string a number?) - day 7
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getAllPermutations (gets all permutations of an array) - day 9
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md5 - (counts md5 hash) - day 4
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sumDivisors (two versions), logDivisors - (for counting divisors of a number) - day 20