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var getStrongest = function (arr, k) {
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  // sort array so we can easily find median
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  const sorted = arr.sort((a, b) => a - b);
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  // get index of median
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  const medianIndex = Math.floor((sorted.length - 1) / 2);
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  // get median
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  const median = sorted[medianIndex];
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  // custom sort function following the parameters given us in the description
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  const compareFunction = (a, b) => {
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    if (Math.abs(a - median) > Math.abs(b - median)) {
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      return 1;
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    } else if (Math.abs(a - median) === Math.abs(b - median) && a > b) {
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      return 1;
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    } else {
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      return -1;
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    }
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  };
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  // sort array using our custom sort function
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  const strongest = arr.sort(compareFunction).reverse().slice(0, k);
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  return strongest;
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};