Seems like it works

console.log({name: 'fred', age: 65}.name);  //fred
console.log({name: 'fred', age: 65}.age);   //65

until I try to use a method

{greet(){console.log('hello');}}.greet();   //Uncaught SyntaxError: unexcted token: '{'

Assigning an identical object literal to a const and then invoking its method works

const greeter = {greet(){console.log('hello');}};
greeter.greet();                                    //hello 

Is such usage not allowed?

CodePudding user response：

You just lack () to properly call the anonymous object

({ greet() { console.log('hello'); } }).greet() // hello