Implement merge function for sorted arrays

Author: jyoung2419

leetcode3/정진영/88. Merge Sorted Array

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+/**
+ * @param {number[]} nums1
+ * @param {number} m
+ * @param {number[]} nums2
+ * @param {number} n
+ * @return {void} Do not return anything, modify nums1 in-place instead.
+ */
+var merge = function(nums1, m, nums2, n) {
+    const arr = [];
+    arr.push(...nums1.slice(0,m));
+    arr.push(...nums2.slice(0,n));
+    arr.sort((a,b) => a-b);
+
+    for (let i = 0; i<nums1.length; i++){
+        nums1[i] = arr[i];
+    }
+    return nums1;
+};