Correct a function with let defined inside it

Author: carlosyabreu

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

@@ -1,13 +1,34 @@
 // Predict and explain first...
 //  =============> write your prediction here
 
+// Predict and explain first...
+//  =============> write your prediction here
+// This code will throw an error: "SyntaxError: Identifier 'str' has already been declared".
+// The reason is that the variable 'str' is declared twice — once as a function parameter
+// and again with `let str` inside the function. You cannot redeclare a parameter variable
+// using `let` or `const` in the same scope.
+
 // call the function capitalise with a string input
 // interpret the error message and figure out why an error is occurring
 
+// function capitalise(str) {
+//  let str = `${str[0].toUpperCase()}${str.slice(1)}`;
+//  return str;
+// }
+
+// =============> write your explanation here
+
+// The error occurs because 'str' is already defined as a parameter to the function.
+// Using 'let str' again inside the function tries to redeclare it, which is not allowed.
+// We can fix this by either using a different variable name or by reassigning 'str'
+// directly without redeclaring it.
+
+// =============> write your new code here
 function capitalise(str) {
-  let str = `${str[0].toUpperCase()}${str.slice(1)}`;
+  str = `${str[0].toUpperCase()}${str.slice(1)}`;
   return str;
 }
 
-// =============> write your explanation here
-// =============> write your new code here
+// Example:
+console.log(capitalise("hello")); // Output: "Hello"
+