code error explained and rewritten

Author: zilinskyte

Sprint-2/1-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
+// constant decimalNumber is being declared twice within the same scope, which will cause a syntax error.
 
 // Try playing computer with the example to work out what is going on
 
-function convertToPercentage(decimalNumber) {
-  const decimalNumber = 0.5;
-  const percentage = `${decimalNumber * 100}%`;
+//function convertToPercentage(decimalNumber) {
+  //const decimalNumber = 0.5;
+  //const percentage = `${decimalNumber * 100}%`;
 
-  return percentage;
-}
+  //return percentage;
+//}
 
-console.log(decimalNumber);
+//console.log(decimalNumber);
 
 // =============> write your explanation here
+// SyntaxError: Identifier 'decimalNumber' has already been declared
+// decimalNumber is declared as a parameter of the function and then again inside the function using const.
+// In JavaScript, you cannot declare the same variable name in the same scope using let or const.
+// Function input is ignored if a variable with the same name is declared inside the function body.
+// const decimalNumber = 0.5 will always output 50% regardless of the input value.
 
 // 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(0.75)); // Example call to test the function