scrabble-solver/packages/scrabble-solver/src/lib/createNullMovingComparator.ts

Scrabble Solver 2 - Free, open-source, cross-platform, multi-language analysis tool for Scrabble, Scrabble Duel, Super Scrabble, Letter League, Crossplay, Literaki, and Kelimelik. Quickly find the top-scoring words using the given board and tiles.

export const createNullMovingComparator = <T>(direction: 'left' | 'right') => {
  return (a: T | null, b: T | null): number => {
    if (a === b) {
      return 0;
    }

    if (a === null) {
      return direction === 'right' ? 1 : -1;
    }

    if (b === null) {
      return direction === 'right' ? -1 : 1;
    }

    return 0;
  };
};