Function search

javascript/0041-first-missing-positive.js:29–40

(nums, index = 0)

};

const search = (nums, index = 0) => {
    while (index < nums.length) {
        const num = nums[index];
        const indexKey = index + 1;

        if (!isEqual(num, indexKey)) return indexKey;

        index += 1;
    }

    return nums.length + 1;
};

const canSwap = (nums, num, indexNum) =>
    isPositive(num) && isInBound(num, nums) && !isEqual(num, indexNum);