Is there a shorthand for this in ES6/ES7?

问题

I'm having a bit of a brainfart. Is there a shorthand for this in ES6/ES7?

res.locals.hello = hello

I've tried a few different combinations but can't get anything to stick.

回答1:

I don't believe there is a shorter way to arbitrarily attach a new key to an object, and automatically assign a reference with the same name. However, during the construction of your locals object, you can simply provide the handler:

let res = {
    locals: { hello }
};

This is effectively the same as:

let res = {
    locals: {
        hello: hello
    }
};

This enhancement was added in ES6, and is supported by all transpilers to my knowledge.

回答2:

Yes, assuming res already exists, using res.locals = { hello } works just fine.

来源：https://stackoverflow.com/questions/33658893/is-there-a-shorthand-for-this-in-es6-es7