concatproto.md

Rx.Observable.prototype.concat(...args)

Ⓢ

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

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

Dist:

• rx.js
• rx.compat.js
• rx.lite.js
• rx.lite.compat.js

Prerequisites:

• rx.js | rx.compat.js | rx.lite.js | rx.lite.compat.js

NPM Packages:

• rx

NuGet Packages:

• RxJS-All
• RxJS-Main
• RxJS-Lite

Unit Tests:

• /tests/observable/concat.js