Fix redeclaration error and update console.log

Removed redeclaration of decimalNumber and updated console.log to call the function.

Author: khaliun-dev

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

@@ -1,20 +1,47 @@
 // Predict and explain first...
 
 // Why will an error occur when this program runs?
-// =============> write your prediction here
+// =============> write your prediction here: potential error, decimalNumber has already been declared, can't redaclare it again with a new variable in the same scope.
+//another error could be, console.log will try to access a local variable from the global scope. 
 
 // Try playing computer with the example to work out what is going on
 
+// step one: function convertToPercentage(decimalNumber)
+// function created with a parameter named (decimalNumber)
+// step two: const decimalNumber = 0.5;
+// error occurs because decimalNumber has been declared already in the fucntion, cannot declare another one with the same name , in the same scope. 
+// program stops.
+// we have fixed the first error. Code runs again.
+// step three:  const percentage = `${decimalNumber * 100}%`;
+// new variable called percentage created, then the JS code is inserted, where decimalNumber is multiplied by 100.
+// no errors here
+// step four:  return percentage;
+// this line sends the value out of the function then stops the function. No errors so far. 
+// Step five: console.log(decimalNumber);
+// error occurs again, because the value created in step four can't be stored in console.log, due to decimalNumber being a parameter inside the function. Outside the function
+// there is no variable named decimalNumber.
+// we have fixed console.log with (convertToPercentage(0.5), now the result will print properly.
+
+
+
+//function convertToPercentage(decimalNumber) {
+//  const decimalNumber = 0.5;
+//  const percentage = `${decimalNumber * 100}%`;
+
+//  return percentage;
+//}
+
+//console.log(decimalNumber);
+
+// =============> write your explanation here: my error predictions turned out to be true and i have played computer with js code to further illustrate my reasoning. 
+
+// Finally, correct the code to fix the problem
+// =============> write your new code here:
+
 function convertToPercentage(decimalNumber) {
-  const decimalNumber = 0.5;
   const percentage = `${decimalNumber * 100}%`;
-
   return percentage;
 }
 
-console.log(decimalNumber);
-
-// =============> write your explanation here
+console.log(convertToPercentage(0.5));
 
-// Finally, correct the code to fix the problem
-// =============> write your new code here