xstream
Version:
An extremely intuitive, small, and fast functional reactive stream library for JavaScript
96 lines • 7.77 kB
JavaScript
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
var index_1 = require("../index");
var ConcatProducer = /** @class */ (function () {
function ConcatProducer(streams) {
this.streams = streams;
this.type = 'concat';
this.out = null;
this.i = 0;
}
ConcatProducer.prototype._start = function (out) {
this.out = out;
this.streams[this.i]._add(this);
};
ConcatProducer.prototype._stop = function () {
var streams = this.streams;
if (this.i < streams.length) {
streams[this.i]._remove(this);
}
this.i = 0;
this.out = null;
};
ConcatProducer.prototype._n = function (t) {
var u = this.out;
if (!u)
return;
u._n(t);
};
ConcatProducer.prototype._e = function (err) {
var u = this.out;
if (!u)
return;
u._e(err);
};
ConcatProducer.prototype._c = function () {
var u = this.out;
if (!u)
return;
var streams = this.streams;
streams[this.i]._remove(this);
if (++this.i < streams.length) {
streams[this.i]._add(this);
}
else {
u._c();
}
};
return ConcatProducer;
}());
/**
* Puts one stream after the other. *concat* is a factory that takes multiple
* streams as arguments, and starts the `n+1`-th stream only when the `n`-th
* stream has completed. It concatenates those streams together.
*
* Marble diagram:
*
* ```text
* --1--2---3---4-|
* ...............--a-b-c--d-|
* concat
* --1--2---3---4---a-b-c--d-|
* ```
*
* Example:
*
* ```js
* import concat from 'xstream/extra/concat'
*
* const streamA = xs.of('a', 'b', 'c')
* const streamB = xs.of(10, 20, 30)
* const streamC = xs.of('X', 'Y', 'Z')
*
* const outputStream = concat(streamA, streamB, streamC)
*
* outputStream.addListener({
* next: (x) => console.log(x),
* error: (err) => console.error(err),
* complete: () => console.log('concat completed'),
* })
* ```
*
* @factory true
* @param {Stream} stream1 A stream to concatenate together with other streams.
* @param {Stream} stream2 A stream to concatenate together with other streams. Two
* or more streams may be given as arguments.
* @return {Stream}
*/
function concat() {
var streams = [];
for (var _i = 0; _i < arguments.length; _i++) {
streams[_i] = arguments[_i];
}
return new index_1.Stream(new ConcatProducer(streams));
}
exports.default = concat;
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xuZXhwb3J0IGRlZmF1bHQgZnVuY3Rpb24gY29uY2F0PFQ+KC4uLnN0cmVhbXM6IEFycmF5PFN0cmVhbTxUPj4pOiBTdHJlYW08VD4ge1xuICByZXR1cm4gbmV3IFN0cmVhbTxUPihuZXcgQ29uY2F0UHJvZHVjZXIoc3RyZWFtcykpO1xufVxuIl19