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Discussion on: Daily Coding Puzzles - Nov 4th - Nov 9th

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Replies for: Wednesday Array.diff (6 KYU): Your goal in this kata is to implement a difference function, which subtracts one list from another and returns th...

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Courtney • 
function array_diff(a, b) {
  let counter = {};
  for(let i of b) {
    counter[i] = true;
  }
  let result = a.filter(item => counter[item] !== true);
  return result;
}