30-seconds-of-code/snippets/inRange.md

inRange

Checks if the given number falls in the given range.

Use arithmetic comparison to check if the given number is in the specified range. If the second parameter, end, is not specified, the reange is considered to be from 0 to start.

const inRange = (n, start, end=null) => {
  if(end && start > end) end = [start, start=end][0];
  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