Problems

Given two sorted integer arrays nums1 and nums2, merge nums2 into nums1 as one sorted array.

Note:
You may assume that nums1 has enough space (size that is greater or equal to m + n) to hold additional elements from nums2. The number of elements initialized in nums1 and nums2 are m and n respectively.

Solution:

var merge = function(nums1, nums2) {
    if(nums1.length === 0) { return nums2; }
    if(nums2.length === 0) { return nums1; }
    Array.prototype.push.apply(nums1, nums2);
    return nums1.sort();
};