Error 对象有文字语法吗？

Question

I found so far that most fundamental objects have literal syntax

Numeric literal is a sequence of digits 453

String literal consists of characters enclosed in quotes. "yes"

Boolean type has two literal values: true and false.

Object literal is a list of name and value pairs in curly braces {}

Array literal is a list enclosed in square brackets [].

Function literal , synonym for function expression var add = function (a, b) {return a + b}

Date objects have no literal syntax.

RegExp literal is a pattern enclosed between slashes var re = /abc/;

Error objects have no literal syntax???

Symbol has no literal syntax.

Also Promise has no literal syntax (maybe later?)

Please confirm is it true that Error can be created only with new and it has no literal syntax

Answer 1

There's nothing inherently special about the Error class in JavaScript - it's a class just like any other that by convention and specification is the base class for errors generated by the language and from the standard APIs.

The throw keyword doesn't even require that the argument passed to throw be an instance of an Error . You can throw "error" and the string will be what's passed to the catch block.

Consequently, there's no special literal syntax for it. It is not however necessary to use new - you can just call Error(msg) and it will return a newly created object for you.