Add helper method recusion pattern

Author: dmakwt

7-recursion/factorial.js

@@ -12,7 +12,6 @@ const factorial = (num) => {
 console.log(factorial(10));
 
 // Recursive solution
-
 const factorialRe = (num) => {
   if (num === 1) {
     return 1;

7-recursion/helperMethodRecursion.js

@@ -0,0 +1,23 @@
+// Helper Method Recursion Pattern
+
+const collectOddValues = (arr) => {
+  let result = [];
+
+  function helper(helperInputer) {
+    if (helperInputer.length === 0) {
+      return;
+    }
+
+    if (helperInputer[0] % 2 !== 0) {
+      result.push(helperInputer[0]);
+    }
+
+    helper(helperInputer.slice(1));
+  }
+
+  helper(arr);
+
+  return result;
+};
+
+console.log(collectOddValues([0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]));