created two prameter inside the add function

assigned each with a value 8 and 10
add the two variable using the plus operator
assign the result to the result variable and return the result variable

08_calculator/calculator.js

@@ -1,9 +1,15 @@
-const add = function() {
+const add = function(firstValue, secondValue) {
+  firstValue = 8
+  secondValue = 10
+  result = firstValue + secondValue
+  return result
+  
 	
 };
 
 const subtract = function() {
   
+	
 };
 
 const sum = function() {