up

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

@@ -0,0 +1,16 @@
+```js run untrusted
+class FormatError extends SyntaxError {
+  constructor(message) {
+    super(message);
+    this.name = "FormatError";
+  }
+}
+
+let err = new FormatError("formatting error");
+
+alert( err.message ); // formatting error
+alert( err.name ); // FormatError
+alert( err.stack ); // stack
+
+alert( err instanceof SyntaxError ); // true
+```