Solved task 1-key-errors/1.js

Author: Konvaly

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

@@ -2,19 +2,31 @@
 
 // Why will an error occur when this program runs?
 // =============> write your prediction here
+// I suppose the error could be:
+// 1. The variable "decimalNumber" declared twice in the same scope (in the function's parameter and in the function's body)
+// 2. We can't reassign a value if we use word "const" to declare a variaable
+// 3. The variable "decimalNumber" isn't defined in the global scope, so when we try to use function console.log(decimalNumber) it will throw a ReferenceError. If we want to log the result of the function we have to call this function with some argument: console.log(convertToPercentage(0.5))
 
 // 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
+//So, when I run the code, I got "SyntaxError: Identifier 'decimalNumber' has already been declared" and that the same as my prediction above. I didn't think that actually we don't need to declare "decimalNumber" again inside the function, and I removed line  "const decimalNumber = 0.5; to fix the problem. THen, I called the function with the argument 0.5 in console.log and this worked fine.
 
 // 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));