Fix the error and explain

Author: arunkumarakilan

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

@@ -1,13 +1,30 @@
-// Predict and explain first...
+// Predict and explain first...  
+//Syntax error
 //  =============> write your prediction here
+// We pass str as a parameter to the function.
+//The parameter becomes a local variable inside the function scope.
+//Therefore, we cannot declare another variable with the same name inside 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)}`;
+  str = `${str[0].toUpperCase()}${str.slice(1)}`;
   return str;
 }
-
+let result = capitalise("Arun");
+console.log(result);
 // =============> write your explanation here
+// The parameter str is already a local variable inside the function.
+// Previously, redeclaring it using let caused an error because variables cannot be declared twice in the same scope.
+// Instead of redeclaring it, I modified the existing str variable and returned it.
+// This avoids the redeclaration error and the code runs correctly.
 // =============> write your new code here
+function capitalise(str) {
+  str = `${str[0].toUpperCase()}${str.slice(1)}`;
+  return str;
+}
+let str = capitalise("Arun");
+console.log(str);
+
+