Fix variable redeclaration error in capitalise function and update comments for clarity

Author: Alex-Os-Dev-Lab

Sprint-2/1-key-errors/0.js

@@ -1,5 +1,6 @@
 // Predict and explain first...
-//  =============> write your prediction here
+//  =============> The code will throw an error because the variable str is a reserved keyword in JavaScript and cannot be used as a variable name.
+//                 The error message will likely indicate that there is a syntax error or that the variable name is invalid.
 
 // call the function capitalise with a string input
 // interpret the error message and figure out why an error is occurring
@@ -9,5 +10,25 @@ function capitalise(str) {
   return str;
 }
 
+console.log(str);
+
 // =============> write your explanation here
+
+//  C:\Users\alexo\CYF\Module-Structuring-and-Testing-Data\Module-Structuring-and-Testing-Data\Sprint-2\1-key-errors\0.js:8
+//  let str = `${str[0].toUpperCase()}${str.slice(1)}`;
+//      ^
+
+// SyntaxError: Identifier 'str' has already been declared
+
+// The error message indicates that there is a syntax error in the code because the variable name 'str' has already been declared.
+
+// In the function capitalise, the parameter 'str' is declared as a variable name, and then within the function body, there is another declaration of 'str' using the let keyword.
+// This creates a conflict because 'str' is already declared as a parameter, and it cannot be redeclared as a variable within the same scope.
+
 // =============> write your new code here
+function capitalise(str) {
+  let capitalised = `${str[0].toUpperCase()}${str.slice(1)}`;
+  return capitalised;
+}
+
+console.log(capitalise("alex"));