30-seconds-of-code/snippets/in-range.md

title, tags, cover, firstSeen, lastUpdated

title	tags	cover	firstSeen	lastUpdated
Number in range	math	armchair	2017-12-20T18:33:58+02:00	2020-11-01T20:50:57+02:00

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