My Calendar II LeetCode solution in JavaScript

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var MyCalendarTwo = function () {
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  this.calendar = [];
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  this.overlaps = [];
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};
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/**
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 * @param {number} start
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 * @param {number} end
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 * @return {boolean}
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 */
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MyCalendarTwo.prototype.book = function (start, end) {
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  for (let date of this.overlaps) {
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    if (start < date[1] && end > date[0]) return false;
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  }
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  for (let date of this.calendar) {
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    if (start < date[1] && end > date[0]) {
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      this.overlaps.push([Math.max(date[0], start), Math.min(date[1], end)]);
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    }
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  }
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  this.calendar.push([start, end]);
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  return true;
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};