3Sum Closest

var threeSumClosest = function(nums, target) {
    if (nums.length < 3) {
        return -1;
    }

    nums = nums.sort(function(num1, num2) {
        return num1 - num2;
    });

    console.log(nums);

    var i, l, r, sum, ret, first = true;

    for (i = 0; i < nums.length - 2; i++) {
        l = i + 1;
        r = nums.length - 1;

        while (l < r) {
            sum = nums[i] + nums[l] + nums[r];

            if (first) {
                ret = sum;
                first = false;
            } else {
                if (Math.abs(sum - target) < Math.abs(ret - target)) {
                    ret = sum;
                }

                if (sum === target) {
                    return target;
                } else if (sum > target) {
                    r--;
                } else {
                    l++;
                }
            }
        }
    }

    return ret;
};