Done

index.js

@@ -0,0 +1,46 @@
+function add(){}
+function subtract(){}
+function multiply(){}
+function divide(){}
+
+var number
+
+function add(a, b){
+  number = a + b
+  return number
+}
+
+function subtract(a, b){
+  number= a - b
+  return number
+}
+
+function multiply(a, b){
+  number= a * b
+  return number
+}
+
+function divide(a, b){
+  number= a / b
+  return number
+}
+
+function increment(a){
+  number = a + 1
+  return number
+}
+
+function decrement(a){
+  number = a - 1
+  return number
+}
+
+function makeInt(a){
+  number = parseInt(a, 10)
+  return number
+}
+
+function preserveDecimal(a){
+  number = parseFloat(a, 10)
+  return number
+}