123456789101112131415161718192021
export default function containsNearbyDuplicate(    nums: number[],    k: number,): boolean {    const map: Map<number, number> = new Map();    return nums.some((num, index) => {        const other = map.get(num);        if (            map.has(num) &&            typeof other === "number" &&            Math.abs(index - other) <= k        ) {            return true;        } else {            map.set(num, index);        }
        return false;    });}