Can flyd streams be made lazy ?

when you have nodejs style API, you have this:

var fs = requie('fs');

var flyd = requie('flyd');

var read_hello = flyd.stream();

fs.readfile('./hello.txt',read_hello); // <- this runs immediately :(

read_hello.map(function(){/...../});

Is there some magic I can do to turn the stream upside down to make it lazy ?

var fs = requie('fs');

var flyd = requie('flyd');

var read_hello = flyd.stream();

read_hello = flyd.lazy(function(stream){

  fs.readfile('./hello.txt',stream);

});

read_hello.map(function(){/...../}).run(); // <- runs here !

Cheers !

[nordfjord]

don’t worry, I understand what you’re trying to accomplish.

I’m curious about your use case though, what use case do you have that requires lazy streams?

[nordfjord]

Hey @sourcevault ! Glad you found a solution!

I think you might be able to make a generic nodeback -> Stream function.

function fromNode(fn) {
  return (...args)=> {
    const s = stream()
    fn(...args, (err, data)=> s(data))
    return s
  }
}

Then you could use that as:

const readFile = fromNode(fs.readFile)

readFile('file1.txt')
  .map(x => x.toString())
  .map(console.log)