Done.

Author: zalkazemi

index.js

@@ -0,0 +1,36 @@
+function add(){}
+function subtract(){}
+function multiply(){}
+function divide(){}
+function add(a, b)
+    {
+      return a + b;
+    }
+function subtract(a, b)
+    {
+      return a - b;
+    }
+function multiply(a, b)
+    {
+      return a * b;
+    }
+function divide(a, b)
+    {
+      return a / b;
+    }
+function increment(n)
+    {
+      return n+=1;
+    }
+function decrement(n)
+    {
+      return n-=1;
+    }
+function makeInt(n)
+    {
+      return parseInt(n,10);
+    }
+function preserveDecimal(n)
+    {
+      return parseFloat(n);
+    }