Detect Pattern of Length M Repeated K or More Times LeetCode solution in JavaScript

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var containsPattern = function (arr, m, k) {
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  for (let i = m, cnt = 0; i < arr.length; i++) {
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    if (arr[i] != arr[i - m]) cnt = 0;
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    else if (++cnt == m * (k - 1)) return true;
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  }
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  return false;
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};