inRange

JavaScript, Math

Checks if the given number falls within the given range.

  • Use arithmetic comparison to check if the given number is in the specified range.
  • If the second argument, end, is not specified, the range is considered to be from 0 to start.
const inRange = (n, start, end = null) => {
  if (end && start > end) [end, start] = [start, end];
  return end == null ? n >= 0 && n < start : n >= start && n < end;
};
inRange(3, 2, 5); // true
inRange(3, 4); // true
inRange(2, 3, 5); // false
inRange(3, 2); // false

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