Codes from Christmas coding event.
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Array.prototype.sum - day 1
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test for counting characters in a string - speed testing
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String.prototype.countChar (winner of speed testing) - speed testing
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String.prototype.setCharAt - day 3, day 4
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Array.prototype.countChar - day 3, day 4, day 6
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String.prototype.isLower (isupper in Python) - day 5
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String.prototype.isUpper (islower in Python) - day 5
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String.prototype.react (delete two characters from a string) - day 5
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String.prototype.dispose (delete one character from a string) - day 5
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ord, chr (same as in Python and PHP) - day 6
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countManhattan (counts Manhattan distance) - day 6 and much more in day 23
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Array.from({length:players}).map(x => 0) (creating array of zeroes) - day 9
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Array.prototype.intersection (intersection of arrays) - day 16
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different sorting functions - day 24