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Discussion on: Rethinking JavaScript: The complete elimination and eradication of JavaScript's this.

 
joelnet profile image
JavaScript Joel

No one could possibly be overwhelmed by this.

I'm am perplexed by your ability to understand the complexities of null and at the same time miss the complexities of a more simple concept being this.

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qm3ster profile image
Mihail Malo

What's the advantage of pointfree propEq usage? Isn't that less immediately readable than x=>x.type==='match'?
I feel like passing key names around in strings is strictly worse and should be avoided whenever it can. So much so, that if you have to use index notation on a non-Array object because your name is truly dynamic, you should actually be using an ES6 Map instead.

I can see the top Event, message, has an excuse to use Observable to filter, but why is

  Observable.fromEvent(websocket, 'error')
    .subscribe(err => events.emit('gdax.ERROR', { exchange, err }))

not just

  websocket.on('error', err => events.emit('gdax.ERROR', { exchange, err }))

And such?

Most importantly, how do you clean up the observables when the websocket closes? It seems that the websocket object and the three observables will never be collected, and a new call to default would just make a new one in parallel.

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joelnet profile image
JavaScript Joel

What's the advantage of pointfree propEq usage?

I just got into the habbit of using it. I can go either way on this one. The advantage is when you use something like path(['one', 'two', 'three']) instead of obj && obj.one && obj.one.two && obj.one.two.three so prop and propEq are similar which is why I used them.

I can see the top Event, message, has an excuse to use Observable to filter, but why is

Just for consistency again. So all "subscriptions" have the same interface. Again, I could have gone either way.

Most importantly, how do you clean up the observables when the websocket closes?

If I remember correctly, I am handling this by exiting the app completely. I have another process that restarts it. I had some issues with closing / reopening some websockets and this app wasn't critical to stay open, so I hard exit.