alexweej / es-extensible-collection-literal Goto Github PK

Using an object as a key in a Map is common—it's certainly one of the most valuable use cases of a Map, but this proposal mentions nothing about that.

So does this:

const key = {};
const map = new Map([ [key, 1] ]);

Mean the same as:

const key = {};
const map = Map#{
  key: 1
};

I think the syntax is very confusing if the LHS of a key/value pairing is an identifier - I'd suggest tweaking it so that it matches object literal syntax: it's a string, unless it's inside brackets, where it's computed just like in object literals and class.