Implement function to calculate absolute difference

Author: jyoung2419

leetcode3/정진영/3774. Absolute Difference Between Maximum and Minimum K Elements

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+/**
+ * @param {number[]} nums
+ * @param {number} k
+ * @return {number}
+ */
+var absDifference = function(nums, k) {
+    const arr = nums.sort((a, b) => a-b);
+    let sum1 = 0;
+    let sum2 = 0;
+    for(let i = 0; i<k; i++){
+        sum1 += arr[i];
+        sum2 += arr[arr.length-i-1];
+    }
+    let abs = sum2 - sum1;
+    return abs;
+};