Remove redeclaration of parameter and undefined variable usage in convertToPercentage

Author: HoussamLh

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

@@ -1,4 +1,9 @@
 // Predict and explain first...
+// =============> write your prediction here
+//   I predict this program will throw a `SyntaxError` because 
+// the parameter `decimalNumber` is being redeclared inside the function using `const`. 
+// Also, the variable `decimalNumber` is being accessed outside the function where it's not defined.
+
 
 // Why will an error occur when this program runs?
 // =============> write your prediction here
@@ -15,6 +20,20 @@ function convertToPercentage(decimalNumber) {
 console.log(decimalNumber);
 
 // =============> write your explanation here
+// The function already has a parameter named `decimalNumber`, 
+// but inside the function, it's trying to declare another 
+// constant with the same name: `const decimalNumber = 0.5;`. 
+// JavaScript doesn’t allow redeclaring a variable that already exists in the same scope.  
+// Also, `console.log(decimalNumber)` is outside the function and `decimalNumber` is not 
+// defined in the global scope, so that will cause a `ReferenceError`.
+
 
 // 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));