sebmarkbage / ecmascript-generator-expression Goto Github PK

I made a ECMAScript generator transform Babel plugin:
https://github.com/clemmy/babel-plugin-transform-generator-expression.

Since it requires a forked parser to dabble with, I made a CodePen where you can easily try out the syntax:
https://codepen.io/clemmy/pen/zpGaNv?editors=1000

Perhaps this can be incorporated as a part of the proposal draft?

I was also posting this in the do proposal:
tc39/proposal-do-expressions#9

To me, it sounds most logical that if any of the if, switch, for, while, try keywords are used in an expression context, then it will be an implicit do expression construction:

So the following

const num  = if (cond) {
  100; 
} else {
  10;
};

would be equivalent to:

const num  = do {
  if (cond) {
    100; 
  } else {
    10;
  }
}

Similarly, the following

const iterable = for (let user of users) {
  if (user.name.startsWith('A'))
    yield user;
}

would be equivalent to

const iterable = do* {
  for (let user of users) {
    if (user.name.startsWith('A'))
      yield user;
  }
};