Create _benchmarks/sum-without-array-vs-sum-with-array.md

_benchmarks/sum-without-array-vs-sum-with-array.md

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+---
+title: sum without array vs sum with array
+setup: |
+
+tests:
+  -
+    name: sum without array
+    code: |
+      function sumOddNumbers() { // since maxVal = 5000, no parameters will be called
+          var sum = 0;           // as this will remove edge cases where maxVal <= 0
+          var oddNumbersArray = [];
+          for (var i=1; i < 5000; i += 2) { 
+            oddNumbersArray.push(i);
+          }
+          for (var j=0, n=oddNumbersArray.length; j < n; j++) {
+            sum += oddNumbersArray[j];
+          }
+          console.log(sum);
+          return sum;
+      }
+  -
+    name: sum with array
+    code: |
+      function sumOddNumbers() { // since maxVal = 5000, no parameters will be called
+          var sum = 0;           // as this will remove edge cases where maxVal <= 0
+          for (var i=1; i < 5000; i += 2) { 
+            sum += i;
+          }
+          console.log(sum);
+          return sum;
+      }
+
+      sumOddNumbers();
+---
+