key error 0.1

Author: Christelle-b

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

@@ -1,20 +1,30 @@
 // Predict and explain first...
 
 // Why will an error occur when this program runs?
-// =============> write your prediction here
+// Here the name decimalNumber in 'const decimalNumber' has already been used, so we will get a synthax Error for that line. 
 
 // Try playing computer with the example to work out what is going on
 
+// function convertToPercentage(decimalNumber) {
+//   const decimalNumber = 0.5;
+//   const percentage = `${decimalNumber * 100}%`;
+
+//   return percentage;
+// }
+
+// console.log(decimalNumber);
+
+// JavaScript is read from top to bottom, so when the processor reads an error, the program will stop running and will get the error message.
+//The first error is on line 9 with the reuse of the variable declaration name of 'decimalNumber.
+//The second error is on line 15 where we are trying to call the variable 'decimalNumber',which is a local variable inside the function. We cannot access this variable outside of the function. We will need to call the whole function.
+// Finally, correct the code to fix the problem
+// =============> write your new code here
 function convertToPercentage(decimalNumber) {
-  const decimalNumber = 0.5;
-  const percentage = `${decimalNumber * 100}%`;
+  const decimalNumber1 = 0.5;
+  const percentage = `${decimalNumber1 * 100}%`;
 
   return percentage;
 }
 
-console.log(decimalNumber);
-
-// =============> write your explanation here
+console.log(convertToPercentage());
 
-// Finally, correct the code to fix the problem
-// =============> write your new code here