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### `Rx.Observable.concat(...args)`
[Ⓢ](https://github.com/Reactive-Extensions/RxJS/blob/master/src/core/linq/observable/concat.js "View in source")
Concatenates all of the specified observable sequences, as long as the previous observable sequence terminated successfully.
#### Arguments
1. `args` *(`Array` | `arguments`)*: Observable sequences or Promises to concatenate.
#### Returns
*(`Observable`)*: An observable sequence that contains the elements of each given sequence, in sequential order.
#### Example
```js
/* Using Observable sequences */
var source1 = Rx.Observable.return(42);
var source2 = Rx.Observable.return(56);
var source = Rx.Observable.concat(source1, source2);
var subscription = source.subscribe(
function (x) {
console.log('Next: ' + x);
},
function (err) {
console.log('Error: ' + err);
},
function () {
console.log('Completed');
});
// => Next: 42
// => Next: 56
// => Completed
/* Using Promises and Observable sequences */
var source1 = Rx.Observable.return(42);
var source2 = RSVP.Promise.resolve(56);
var source = Rx.Observable.concat(source1, source2);
var subscription = source.subscribe(
function (x) {
console.log('Next: ' + x);
},
function (err) {
console.log('Error: ' + err);
},
function () {
console.log('Completed');
});
// => Next: 42
// => Next: 56
// => Completed
```
### Location
File:
- [`/src/core/linq/observable/concat.js`](https://github.com/Reactive-Extensions/RxJS/blob/master/src/core/linq/observable/concat.js)
Dist:
- [`rx.all.js`](https://github.com/Reactive-Extensions/RxJS/blob/master/dist/rx.all.js)
- [`rx.all.compat.js`](https://github.com/Reactive-Extensions/RxJS/blob/master/dist/rx.all.compat.js)
- [`rx.js`](https://github.com/Reactive-Extensions/RxJS/blob/master/dist/rx.js)
- [`rx.compat.js`](https://github.com/Reactive-Extensions/RxJS/blob/master/dist/rx.compat.js)
- [`rx.lite.js`](https://github.com/Reactive-Extensions/RxJS/blob/master/dist/rx.lite.js)
- [`rx.lite.compat.js`](https://github.com/Reactive-Extensions/RxJS/blob/master/dist/rx.lite.compat.js)
Prerequisites:
- None
NPM Packages:
- [`rx`](https://www.npmjs.org/package/rx)
NuGet Packages:
- [`RxJS-Complete`](http://www.nuget.org/packages/RxJS-Complete)
- [`RxJS-Main`](http://www.nuget.org/packages/RxJS-Main/)
- [`RxJS-Lite`](http://www.nuget.org/packages/RxJS-Lite/)
Unit Tests:
- [`/tests/observable/concatproto.js`](https://github.com/Reactive-Extensions/RxJS/blob/master/tests/observable/concatproto.js)
|
