remove duplicate variable declaration in capitalise function

Author: khalidbih

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

@@ -1,13 +1,22 @@
 // Predict and explain first...
 //  =============> write your prediction here
+// It will give an error because the variable `str`, is declared twice inside the same function,
+// It is already a parameter, and then it is redeclared using `let`.
 
 // 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;
-}
+//function capitalise(str) {
+//  let str = `${str[0].toUpperCase()}${str.slice(1)}`;
+//  return str;
+// }
 
 // =============> write your explanation here
+// The error happens because 'str' is written two times, first, it is the function parameter.
+// Then, it is declared again using 'let', javaScript does not allow declaring the same variable twice, inside the same function.
 // =============> write your new code here
+
+function capitalise(str) {
+  return `${str[0].toUpperCase()}${str.slice(1)}`;
+}
+console.log(capitalise("Code"));