- Remove duplicate const declaration of parameter decimalNumber inside convertToPercentage

- Update console.log to pass argument to convertToPercentage instead of logging decimalNumber

Author: rahanasuleiman8-ship-it

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

@@ -1,20 +1,34 @@
 // Predict and explain first...
+// My prediction: Running this code will result in a SyntaxError because 'decimalNumber' is defined as a parameter in the function declaration, and then re-declared on line 2 using 'const'. In JavaScript, an existing parameter or variable cannot be re-declared in the same scope using 'const' or 'let'. Additionally, calling console.log(decimalNumber) on line 8 will trigger a ReferenceError because 'decimalNumber' is scoped locally to the function and cannot be accessed globally.
 
 // Why will an error occur when this program runs?
 // =============> write your prediction here
+// My prediction: A SyntaxError will occur because 'decimalNumber' is automatically declared as a local variable when passed as a function parameter. Declaring it again inside the function body using 'const decimalNumber = 0.5;' breaks JavaScript's re-declaration rules.
 
 // 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
+// =============> Two errors occurred here:
+// 1. SyntaxError: 'decimalNumber' is automatically declared as a local variable when passed as a function parameter. Declaring it again inside the function body using 'const decimalNumber = 0.5;' breaks JavaScript's re-declaration rules.
+// 2. ReferenceError: I commented out the 'const decimalNumber = 0.5' and got a ReferenceError, this is because 'decimalNumber' only exists within the block scope of the convertToPercentage function. Trying to log console.log(decimalNumber) in the global scope fails because it is not defined out there.
+// Solution: Remove 'const decimalNumber = 0.5;' from inside the function body so the parameter can receive the arguments, and call console.log(convertToPercentage(0.7)) instead of logging the parameter directly.
 
 // 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(0.7)); // output 70%
+console.log(convertToPercentage(0.5)); // output 50%