@reactivex/rxjs
Version:
Reactive Extensions for modern JavaScript
162 lines (152 loc) • 10 kB
HTML
<html>
<head>
<meta charset="utf-8">
<base data-ice="baseUrl" href="../../../">
<title data-ice="title">es6/operator/scan.js | RxJS API Document</title>
<link type="text/css" rel="stylesheet" href="css/style.css">
<link type="text/css" rel="stylesheet" href="css/prettify-tomorrow.css">
<script src="script/prettify/prettify.js"></script>
<script src="script/manual.js"></script>
<script data-ice="userScript" src="user/script/0-Rx.js"></script>
<script data-ice="userScript" src="user/script/1-devtools-welcome.js"></script>
<script data-ice="userScript" src="user/script/2-custom-manual-styles.js"></script>
<script data-ice="userScript" src="user/script/3-decision-tree-widget.min.js"></script>
<script data-ice="userScript" src="user/script/4-theme-toggler.js"></script>
<link data-ice="userStyle" rel="stylesheet" href="user/css/0-main.css">
</head>
<body class="layout-container" data-ice="rootContainer">
<header>
<a href="./">Home</a>
<a href="./manual/index.html" data-ice="manualHeaderLink">Manual</a>
<a href="identifiers.html">Reference</a>
<a href="source.html">Source</a>
<a href="test.html" data-ice="testLink">Test</a>
<a data-ice="repoURL" href="https://github.com/ReactiveX/RxJS" class="repo-url-github">Repository</a>
<div class="search-box">
<span>
<img src="./image/search.png">
<span class="search-input-edge"></span><input class="search-input"><span class="search-input-edge"></span>
</span>
<ul class="search-result"></ul>
</div>
</header>
<nav class="navigation" data-ice="nav"><div>
<ul>
<li data-ice="doc"><span data-ice="kind" class="kind-variable">V</span><span data-ice="name"><span><a href="variable/index.html#static-variable-AsyncSubject">AsyncSubject</a></span></span></li>
<li data-ice="doc"><span data-ice="kind" class="kind-variable">V</span><span data-ice="name"><span><a href="variable/index.html#static-variable-BehaviorSubject">BehaviorSubject</a></span></span></li>
<li data-ice="doc"><span data-ice="kind" class="kind-variable">V</span><span data-ice="name"><span><a href="variable/index.html#static-variable-Notification">Notification</a></span></span></li>
<li data-ice="doc"><span data-ice="kind" class="kind-variable">V</span><span data-ice="name"><span><a href="variable/index.html#static-variable-Observable">Observable</a></span></span></li>
<li data-ice="doc"><span data-ice="kind" class="kind-variable">V</span><span data-ice="name"><span><a href="variable/index.html#static-variable-ReplaySubject">ReplaySubject</a></span></span></li>
<li data-ice="doc"><span data-ice="kind" class="kind-variable">V</span><span data-ice="name"><span><a href="variable/index.html#static-variable-Scheduler">Scheduler</a></span></span></li>
<li data-ice="doc"><span data-ice="kind" class="kind-variable">V</span><span data-ice="name"><span><a href="variable/index.html#static-variable-AnonymousSubject">AnonymousSubject</a></span></span></li>
<li data-ice="doc"><span data-ice="kind" class="kind-variable">V</span><span data-ice="name"><span><a href="variable/index.html#static-variable-Subject">Subject</a></span></span></li>
<li data-ice="doc"><span data-ice="kind" class="kind-variable">V</span><span data-ice="name"><span><a href="variable/index.html#static-variable-SubjectSubscriber">SubjectSubscriber</a></span></span></li>
<li data-ice="doc"><span data-ice="kind" class="kind-variable">V</span><span data-ice="name"><span><a href="variable/index.html#static-variable-Subscriber">Subscriber</a></span></span></li>
<li data-ice="doc"><span data-ice="kind" class="kind-variable">V</span><span data-ice="name"><span><a href="variable/index.html#static-variable-Subscription">Subscription</a></span></span></li>
<li data-ice="doc"><span data-ice="kind" class="kind-typedef">T</span><span data-ice="name"><span><a href="typedef/index.html#static-typedef-Rx.Scheduler">Rx.Scheduler</a></span></span></li>
<li data-ice="doc"><span data-ice="kind" class="kind-typedef">T</span><span data-ice="name"><span><a href="typedef/index.html#static-typedef-Rx.Symbol">Rx.Symbol</a></span></span></li>
<li data-ice="doc"><div data-ice="dirPath" class="nav-dir-path">observable</div><span data-ice="kind" class="kind-variable">V</span><span data-ice="name"><span><a href="variable/index.html#static-variable-ConnectableObservable">ConnectableObservable</a></span></span></li>
<li data-ice="doc"><div data-ice="dirPath" class="nav-dir-path">observable/dom</div><span data-ice="kind" class="kind-variable">V</span><span data-ice="name"><span><a href="variable/index.html#static-variable-AjaxError">AjaxError</a></span></span></li>
<li data-ice="doc"><span data-ice="kind" class="kind-variable">V</span><span data-ice="name"><span><a href="variable/index.html#static-variable-AjaxResponse">AjaxResponse</a></span></span></li>
<li data-ice="doc"><span data-ice="kind" class="kind-variable">V</span><span data-ice="name"><span><a href="variable/index.html#static-variable-AjaxTimeoutError">AjaxTimeoutError</a></span></span></li>
<li data-ice="doc"><div data-ice="dirPath" class="nav-dir-path">operator</div><span data-ice="kind" class="kind-variable">V</span><span data-ice="name"><span><a href="variable/index.html#static-variable-GroupedObservable">GroupedObservable</a></span></span></li>
<li data-ice="doc"><div data-ice="dirPath" class="nav-dir-path">scheduler</div><span data-ice="kind" class="kind-variable">V</span><span data-ice="name"><span><a href="variable/index.html#static-variable-Action">Action</a></span></span></li>
<li data-ice="doc"><div data-ice="dirPath" class="nav-dir-path">util</div><span data-ice="kind" class="kind-variable">V</span><span data-ice="name"><span><a href="variable/index.html#static-variable-ArgumentOutOfRangeError">ArgumentOutOfRangeError</a></span></span></li>
<li data-ice="doc"><span data-ice="kind" class="kind-variable">V</span><span data-ice="name"><span><a href="variable/index.html#static-variable-EmptyError">EmptyError</a></span></span></li>
<li data-ice="doc"><span data-ice="kind" class="kind-variable">V</span><span data-ice="name"><span><a href="variable/index.html#static-variable-ObjectUnsubscribedError">ObjectUnsubscribedError</a></span></span></li>
<li data-ice="doc"><span data-ice="kind" class="kind-variable">V</span><span data-ice="name"><span><a href="variable/index.html#static-variable-TimeoutError">TimeoutError</a></span></span></li>
<li data-ice="doc"><span data-ice="kind" class="kind-variable">V</span><span data-ice="name"><span><a href="variable/index.html#static-variable-UnsubscriptionError">UnsubscriptionError</a></span></span></li>
<li data-ice="doc"><span data-ice="kind" class="kind-variable">V</span><span data-ice="name"><span><a href="variable/index.html#static-variable-root">root</a></span></span></li>
</ul>
</div>
</nav>
<div class="content" data-ice="content"><h1 data-ice="title">es6/operator/scan.js</h1>
<pre class="source-code line-number raw-source-code"><code class="prettyprint linenums" data-ice="content">import { Subscriber } from '../Subscriber';
/* tslint:disable:max-line-length */
export function scan(accumulator, seed) {
var hasSeed = false;
// providing a seed of `undefined` *should* be valid and trigger
// hasSeed! so don't use `seed !== undefined` checks!
// For this reason, we have to check it here at the original call site
// otherwise inside Operator/Subscriber we won't know if `undefined`
// means they didn't provide anything or if they literally provided `undefined`
if (arguments.length >= 2) {
hasSeed = true;
}
return this.lift(new ScanOperator(accumulator, seed, hasSeed));
}
var ScanOperator = (function () {
function ScanOperator(accumulator, seed, hasSeed) {
if (hasSeed === void 0) { hasSeed = false; }
this.accumulator = accumulator;
this.seed = seed;
this.hasSeed = hasSeed;
}
ScanOperator.prototype.call = function (subscriber, source) {
return source._subscribe(new ScanSubscriber(subscriber, this.accumulator, this.seed, this.hasSeed));
};
return ScanOperator;
}());
/**
* We need this JSDoc comment for affecting ESDoc.
* @ignore
* @extends {Ignored}
*/
var ScanSubscriber = (function (_super) {
__extends(ScanSubscriber, _super);
function ScanSubscriber(destination, accumulator, _seed, hasSeed) {
_super.call(this, destination);
this.accumulator = accumulator;
this._seed = _seed;
this.hasSeed = hasSeed;
this.index = 0;
}
Object.defineProperty(ScanSubscriber.prototype, "seed", {
get: function () {
return this._seed;
},
set: function (value) {
this.hasSeed = true;
this._seed = value;
},
enumerable: true,
configurable: true
});
ScanSubscriber.prototype._next = function (value) {
if (!this.hasSeed) {
this.seed = value;
this.destination.next(value);
}
else {
return this._tryNext(value);
}
};
ScanSubscriber.prototype._tryNext = function (value) {
var index = this.index++;
var result;
try {
result = this.accumulator(this.seed, value, index);
}
catch (err) {
this.destination.error(err);
}
this.seed = result;
this.destination.next(result);
};
return ScanSubscriber;
}(Subscriber));
//# sourceMappingURL=scan.js.map</code></pre>
</div>
<footer class="footer">
Generated by <a href="https://esdoc.org">ESDoc<span data-ice="esdocVersion">(0.4.8)</span></a>
</footer>
<script src="script/search_index.js"></script>
<script src="script/search.js"></script>
<script src="script/pretty-print.js"></script>
<script src="script/inherited-summary.js"></script>
<script src="script/test-summary.js"></script>
<script src="script/inner-link.js"></script>
<script src="script/patch-for-local.js"></script>
</body>
</html>