up

1-js/08-error-handling/2-custom-errors/1-format-error/task.md

@@ -4,9 +4,12 @@ importance: 5
 
 # Inherit from SyntaxError
 
-Create an error `FormatError` that inherits from `SyntaxError`.
+Create a class `FormatError` that inherits from the built-in `SyntaxError` class.
+
+It should support `message`, `name` and `stack` properties.
 
 Usage example:
+
 ```js
 let err = new FormatError("formatting error");
 
@@ -14,5 +17,6 @@ alert( err.message ); // formatting error
 alert( err.name ); // FormatError
 alert( err.stack ); // stack
 
-alert( err instanceof SyntaxError ); // true
+alert( err instanceof FormatError ); // true
+alert( err instanceof SyntaxError ); // true (because inherits from SyntaxError)
 ```