Hi,
This is interesting. You probably had at look at taskjs.org. Generators
are kinds of structured fibers that, yes, can be "abused" to provide some
form of threading. How "unobstrusive" this can be remains to be fully
explored, as you do, in good company (see also streamline implementation
using generators, an interesting exploration too).
Your approach reminds me about the "await" construct in C#, the"yield" in
your example really means "await".
After much thinking, I came to the conclusion that this flow control issue
is not such a big deal, solutions like "promise/a" demonstrates that async
activities can be orchestrated in a readable way without threads. Besides,
early implementations of generators are apparently rather slow (fibers are
fast, non standard... and controversial).
I am conducting an experiment about a similar control flow problem, here is
one result:
var Parole = require('l8/lib/whisper'), fs = require( 'fs' );
var read = Parole(); fs.readFile( __filename, read );
read.on( function( err, data ){ console.log( data.toString( 'utf8' ); } );
// or: read.then( function( data ){ console.log( data.toString( 'utf8' );
} );
This is more concise, does not have the array destructuring issue, runs
today everywhere and is readable once you understand that a Parole() is an
extended Function suitable as a node.js callback.
See https://github.com/JeanHuguesRobert/l8/wiki/ParoleReference. You may be
surprised by the P.generator() easy way of defining an async generator
using today's javascript.
Yours,
Jean Hugues
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