Reactive-Extensions/RxJS

# This is RxJS v 4. [Find the latest version here](https://github.com/reactivex/rxjs)
### `Rx.Observable.prototype.concat(...args)`
[Ⓢ](https://github.com/Reactive-Extensions/RxJS/blob/master/src/core/linq/observable/concatproto.js "View in source")
 
Concatenates all the observable sequences.  This takes in either an array or variable arguments to concatenate.
 
#### Arguments
1. `args` *(arguments | Array)*: An array or arguments of Observable sequences.
 
#### Returns
*(`Observable`)*: An observable sequence that contains the elements of each given sequence, in sequential order.
 
#### Example
```js
var source = Rx.Observable
    .return(42)
    .concat(Rx.Observable.return(56), Rx.Observable.return(72));
 
var subscription = source.subscribe(
    function (x) {
        console.log('Next: ' + x.toString());
    },
    function (err) {
        console.log('Error: ' + err);
    },
    function () {
        console.log('Completed');
    });
 
// => Next: 42
// => Next: 56
// => Next: 72
// => Completed
 
// With a promise
var source = Rx.Observable.just(42)
    .concat(Promise.resolve(42));
 
var subscription = source.subscribe(
    function (x) {
        console.log('Next: ' + x.toString());
    },
    function (err) {
        console.log('Error: ' + err);
    },
    function () {
        console.log('Completed');
    });
 
// => Next: 42
// => Next: 42
// => Completed
```
### Location
 
File:
- [`/src/core/linq/observable/concatproto.js`](https://github.com/Reactive-Extensions/RxJS/blob/master/src/core/linq/observable/concatproto.js)
 
Dist:
- [`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:
- [`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)
 
NPM Packages:
- [`rx`](https://www.npmjs.org/package/rx)
 
NuGet Packages:
- [`RxJS-All`](http://www.nuget.org/packages/RxJS-All/)
- [`RxJS-Main`](http://www.nuget.org/packages/RxJS-Main/)
- [`RxJS-Lite`](http://www.nuget.org/packages/RxJS-Lite/)
 
Unit Tests:
- [`/tests/observable/concat.js`](https://github.com/Reactive-Extensions/RxJS/blob/master/tests/observable/concat.js)