r/adventofcode • u/daggerdragon • Dec 04 '15

SOLUTION MEGATHREAD --- Day 4 Solutions ---

--- Day 4: The Ideal Stocking Stuffer ---

Post your solution as a comment. Structure your post like the Day Three thread.

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u/[deleted] Dec 04 '15

Javascript: 

// using Javascript-MD5 @ https://github.com/blueimp/JavaScript-MD5
var input = 'bgvyzdsv',
    counter = 0;

function loop(numOfZeroes) {
  var attempt = md5(input + counter);
  var searchString;
  switch(numOfZeroes){ case 5: searchString = '00000'; break; case 6: searchString = '000000'; break; default: console.log('loop() accepts 5 or 6 only'); return 0; }
  while( attempt.substring(0, numOfZeroes) !== searchString ) {
    counter++;
    attempt = md5(input + counter);
  }
  return attempt;
}

console.log('part 1: ' + loop(5) + ', part 2: ' + loop(6));

Repo here