spawn.md

This is RxJS v 4. Find the latest version here

Rx.Observable.spawn(fn)

Ⓢ

Spawns a generator function which allows for Promises, Observable sequences, Arrays, Objects, Generators and functions.

Arguments

1. fn (Function): The spawning function.

Returns

(Observable): An Observable with the final result

Example

var Rx = require('rx');

var spawned = Rx.Observable.spawn(function* () {
  var a = yield cb => cb(null, 'a');
  var b = yield ['b'];
  var c = yield Rx.Observable.just('c');
  var d = yield Rx.Observable.just('d');
  var e = yield Promise.resolve('e');
  return a + b + c + d + e;
});

spawned.subscribe(
  function (x) { console.log('next %s', x); },
  function (e) { console.log('error %s', e); },
  function () { console.log('completed'); }
);

// => next 'abcde'
// => completed

Location

File:

• /src/core/linq/observable/spawn.js

Dist:

• rx.async.js
• rx.async.compat.js
• rx.all.js
• rx.all.compat.js

Prerequisites:

• If using rx.async.js | rx.async.compat.js
  • rx.js | rx.compat.js
  • rx.binding.js
• rx.lite.js | rx.lite.compat.js

NPM Packages:

• rx

NuGet Packages:

• RxJS-All
• RxJS-Async

Unit Tests:

• ``/tests/observable/spawn.js`