✅ add solution for Left Rotation problem.

Author: modavidc

Diff for: README.md

@@ -32,7 +32,8 @@
 
 |          Subdomain          |                                                          Challenge                                                           | Score  | Difficulty |                                             Solution                                              |
 |:---------------------------:|:----------------------------------------------------------------------------------------------------------------------------:|:------:|:----------:|:-------------------------------------------------------------------------------------------------:|
-|        Arrays               | [Arrays - DS](https://www.hackerrank.com/challenges/arrays-ds)                                                               |   10   |    Easy    | [solution.js](arrays/arrays-ds.js)                                                           |
+|        Arrays               | [Arrays - DS](https://www.hackerrank.com/challenges/arrays-ds)                                                               |   10   |    Easy    | [solution.js](arrays/arrays-ds.js)                                                                |
+|        Arrays               | [Left Rotation](https://www.hackerrank.com/challenges/array-left-rotation)                                                   |   20   |    Easy    | [solution.js](arrays/left-rotation.js)                                                            |
 
 ## 👤 Author
 

Diff for: arrays/left-rotation.js

@@ -0,0 +1,44 @@
+// Problem: https://www.hackerrank.com/challenges/array-left-rotation/problem
+
+function leftArray(d, arr) {
+  let newArray = [];
+  let tempArray = [];
+
+  if (d === arr.length) {
+    return arr;
+  }
+
+  for (var i = 0; i < arr.length; i++) {
+    if (i + 1 <= d) {
+      tempArray.push(arr[i]);
+    } else {
+      newArray.push(arr[i]);
+    }
+  }
+
+  return newArray.concat(tempArray);
+}
+
+function leftArraySimple(d, arr) {
+  if (d === arr.length) {
+    return arr;
+  }
+
+  const temp = arr.splice(0, d);
+
+  return [...arr, ...temp];
+}
+
+// test 1
+let t1InputRotations = 2;
+let t1InputArray = [1, 2, 3, 4, 5];
+
+let t1Result = leftArray(t1InputRotations, t1InputArray);
+console.log(t1Result);
+
+// test 2
+let t2InputRotations = 2;
+let t2InputArray = [1, 2, 3, 4, 5];
+
+let t2Result = leftArraySimple(t2InputRotations, t2InputArray);
+console.log(t2Result);