Max Chunks To Make Sorted II LeetCode solution in JavaScript

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var maxChunksToSorted = function (arr) {
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  var rmin = new Array(arr.length).fill(0);
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  rmin[arr.length] = Number.MAX_SAFE_INTEGER;
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  for (var i = arr.length - 1; i >= 0; i--) {
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    rmin[i] = Math.min(arr[i], rmin[i + 1]);
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  }
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  var lmax = Number.MIN_SAFE_INTEGER;
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  var count = 0;
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  for (var i = 0; i < arr.length; i++) {
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    lmax = Math.max(arr[i], lmax);
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    if (lmax <= rmin[i + 1]) {
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      count++;
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    }
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  }
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  return count;
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};
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``;