complete ex 1.js

Author: fatimarouchi

Sprint-3/1-key-errors/1.js

@@ -1,20 +1,29 @@
 // Predict and explain first...
 
 // Why will an error occur when this program runs?
-// =============> write your prediction here
+// =============>// I predict a SyntaxError because decimalNumber is declared as a parameter and then declared again with const.
 
 // 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
+/* =============>  decimalNumber is already the function parameter.
+   const decimalNumber tries to declare the same name again inside the function,
+   so JavaScript gives a SyntaxError. */
 
 // Finally, correct the code to fix the problem
 // =============> write your new code here
+function convertToPercentage(decimalNumber) {
+  const percentage = `${decimalNumber * 100}%`;
+
+  return percentage;
+}
+
+console.log(convertToPercentage(0.5));