Predict the output of the provided function, explain the actual error, and write the correct code.

Author: Iswanna

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

@@ -1,13 +1,29 @@
 // Predict and explain first...
 //  =============> write your prediction here
+// Answer
+// If I call the function capitalise with a string input, I predict that it will return an error because the variable str
+// has already been declared as a paramter of the function so it can not be re-declared
 
 // 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
+//Answer
+// The error message "SyntaxError: Identifier 'str' has already been declared" means that the identifier "str" has been declared and so can not be re-declared.
+// This error occured because the same variable name occurs as a function parameter and is then redeclared using a let assignment in a function body again.
+// Redeclaring the same variable within the same function or block scope using let is not allowed in JavaScript.
+
+// =============> write your new code here
+// Answer
 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
+let actualOutput = capitalise("welcome");
+console.log(actualOutput);