Comments (1)
This is what I came up with:
/**
* Wraps a value between min and max, inclusive.
*
* e.g.
*
* expect(wrap(0, 0, 9)).toEqual(0);
* expect(wrap(1, 0, 9)).toEqual(1);
* expect(wrap(9, 0, 9)).toEqual(9);
* expect(wrap(10, 0, 9)).toEqual(0);
* expect(wrap(11, 0, 9)).toEqual(1);
* expect(wrap(19, 0, 9)).toEqual(9);
* expect(wrap(10, 0, 9)).toEqual(0);
* expect(wrap(-1, 0, 9)).toEqual(9);
* expect(wrap(-10, 0, 9)).toEqual(0);
* expect(wrap(-11, 0, 9)).toEqual(9);
*
* expect(wrap(10, 10, 19)).toEqual(10);
* expect(wrap(11, 10, 19)).toEqual(11);
* expect(wrap(19, 10, 19)).toEqual(19);
* expect(wrap(20, 10, 19)).toEqual(10);
*
* @param value
* @param min the minimum inclusive value
* @param max the maximum inclusive value
*/
export function wrap(value: number, min: number, max: number): number {
const rangeSize = max - min + 1;
if (value < min) return max - ((min - value - 1) % rangeSize);
else return min + ((value - min) % rangeSize);
}
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