inRange function

bool inRange(num number, [ num start = 0, num? end ])

Checks if number is between start and up to, but not including, end.

If end is not specified, it's set to start with start then set to 0. If start is greater than end, the parameters are swapped to support negative ranges.

Arguments: number (number): The number to check. start=0 (number): The start of the range. end (number): The end of the range.

Returns: (boolean): Returns true if number is in the range, else false.

Example:

inRange(3, 2, 4);     // => true
inRange(4, 8);         // => true
inRange(4, 2);         // => false
inRange(2, 2);         // => false
inRange(1.2, 2);       // => true
inRange(5.2, 4);       // => false
inRange(-3, -2, -6);   // => true

Implementation

bool inRange(num number, [num start = 0, num? end]) {
  // If end is not specified, set it to start and reset start to 0
  if (end == null) {
    end = start;
    start = 0;
  }

  // If start is greater than end, swap them
  if (start > end) {
    var temp = start;
    start = end;
    end = temp;
  }

  // Check if number is in the range [start, end)
  return number >= start && number < end;
}