Number of Students Doing Homework at a Given Time LeetCode solution in JavaScript

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var busyStudent = function (startTime, endTime, queryTime) {
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  let res = 0;
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  for (let i = 0; i < startTime.length; i++) {
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    if (startTime[i] <= queryTime && endTime[i] >= queryTime) res++;
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  }
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  return res;
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};