Functional Programming Approach to Methods in TypeScript

export class Position extends Data.Class<{
    x: number;
    y: number;
}> {
    toString(): string {
        return `(${this.x}, ${this.y})`;
    }

    getManhattanDistanceTo(other: Position): number {
        return Math.abs(this.x - other.x) + Math.abs(this.y - other.y);
    }

    isAdjacentTo(other: Position): boolean {
        return Math.abs(this.x - other.x) + Math.abs(this.y - other.y) === 1;
    }
}