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How to use 'remove duplicates from array javascript using for loop' in JavaScript

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amandakelake/blog
25function removeDuplicates_for_loop(arr) {
26  let res = [];
27  const len = arr.length;
28  for (let i = 0; i < len; i++) {
29    if (res.indexOf(arr[i]) === -1) {
30      res.push(arr[i]);
31    }
32  }
33  return res;
34}

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