fix proble, answer questions

Author: vmoratti

Sprint-2/1-key-errors/1.js

@@ -1,20 +1,40 @@
 // Predict and explain first...
-
 // Why will an error occur when this program runs?
 // =============> write your prediction here
-
+// I think there will be an error as "decimalNumber" variable has already been declared as a parameter in
+// "convertToPercentage" function
+// 
 // Try playing computer with the example to work out what is going on
 
-function convertToPercentage(decimalNumber) {
+/*function convertToPercentage(decimalNumber) {
   const decimalNumber = 0.5;
   const percentage = `${decimalNumber * 100}%`;
 
   return percentage;
 }
 
-console.log(decimalNumber);
+console.log(decimalNumber); */
 
 // =============> write your explanation here
+// =============Explanation ===============
+// the "decimalNumber" variable is a local variable and can only be seen inside "convertToPercentage" function
+// therefore when called outside the function it triggers "ReferenceError"
 
 // Finally, correct the code to fix the problem
+// =========correction=========
+// problem can be fixed by moving the variable declaration outside the function
+//  and making it global
+
 // =============> write your new code here
+
+const decimalNumber = 0.5;
+function convertToPercentage(decimalNumber) {
+  const percentage = `${decimalNumber * 100}%`;
+
+  return percentage;
+}
+
+console.log(decimalNumber);
+console.log(convertToPercentage(decimalNumber));
+
+