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

inRange

Checks if the given number falls in the given range.

end is an optional parameter. If end is not given, the range is considered 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