@reactivex/rxjs

<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <base data-ice="baseUrl" href="../../../"> <title data-ice="title">spec-js/operators/scan-spec.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">spec-js/operators/scan-spec.js</h1> <pre class="source-code line-number raw-source-code"><code class="prettyprint linenums" data-ice="content">"use strict"; var chai_1 = require('chai'); var Rx = require('../../dist/cjs/Rx'); var Observable = Rx.Observable; /** @test {scan} */ describe('Observable.prototype.scan', function () { asDiagram('scan((acc, curr) => acc + curr, 0)')('should scan', function () { var values = { a: 1, b: 3, c: 5, x: 1, y: 4, z: 9 }; var e1 = hot('--a--b--c--|', values); var e1subs = '^ !'; var expected = '--x--y--z--|'; var scanFunction = function (o, x) { return o + x; }; expectObservable(e1.scan(scanFunction, 0)).toBe(expected, values); expectSubscriptions(e1.subscriptions).toBe(e1subs); }); it('should scan things', function () { var e1 = hot('--a--^--b--c--d--e--f--g--|'); var e1subs = '^ !'; var expected = '---u--v--w--x--y--z--|'; var values = { u: ['b'], v: ['b', 'c'], w: ['b', 'c', 'd'], x: ['b', 'c', 'd', 'e'], y: ['b', 'c', 'd', 'e', 'f'], z: ['b', 'c', 'd', 'e', 'f', 'g'] }; var source = e1.scan(function (acc, x) { return [].concat(acc, x); }, []); expectObservable(source).toBe(expected, values); expectSubscriptions(e1.subscriptions).toBe(e1subs); }); it('should scan with a seed of undefined', function () { var e1 = hot('--a--^--b--c--d--e--f--g--|'); var e1subs = '^ !'; var expected = '---u--v--w--x--y--z--|'; var values = { u: 'undefined b', v: 'undefined b c', w: 'undefined b c d', x: 'undefined b c d e', y: 'undefined b c d e f', z: 'undefined b c d e f g' }; var source = e1.scan(function (acc, x) { return acc + ' ' + x; }, undefined); expectObservable(source).toBe(expected, values); expectSubscriptions(e1.subscriptions).toBe(e1subs); }); it('should scan without seed', function () { var e1 = hot('--a--^--b--c--d--|'); var e1subs = '^ !'; var expected = '---x--y--z--|'; var values = { x: 'b', y: 'bc', z: 'bcd' }; var source = e1.scan(function (acc, x) { return acc + x; }); expectObservable(source).toBe(expected, values); expectSubscriptions(e1.subscriptions).toBe(e1subs); }); it('should handle errors', function () { var e1 = hot('--a--^--b--c--d--#'); var e1subs = '^ !'; var expected = '---u--v--w--#'; var values = { u: ['b'], v: ['b', 'c'], w: ['b', 'c', 'd'] }; var source = e1.scan(function (acc, x) { return [].concat(acc, x); }, []); expectObservable(source).toBe(expected, values); expectSubscriptions(e1.subscriptions).toBe(e1subs); }); it('should handle errors in the projection function', function () { var e1 = hot('--a--^--b--c--d--e--f--g--|'); var e1subs = '^ ! '; var expected = '---u--v--# '; var values = { u: ['b'], v: ['b', 'c'], w: ['b', 'c', 'd'], x: ['b', 'c', 'd', 'e'], y: ['b', 'c', 'd', 'e', 'f'], z: ['b', 'c', 'd', 'e', 'f', 'g'] }; var source = e1.scan(function (acc, x) { if (x === 'd') { throw 'bad!'; } return [].concat(acc, x); }, []); expectObservable(source).toBe(expected, values, 'bad!'); expectSubscriptions(e1.subscriptions).toBe(e1subs); }); it('handle empty', function () { var e1 = cold('|'); var e1subs = '(^!)'; var expected = '|'; var source = e1.scan(function (acc, x) { return [].concat(acc, x); }, []); expectObservable(source).toBe(expected); expectSubscriptions(e1.subscriptions).toBe(e1subs); }); it('handle never', function () { var e1 = cold('-'); var e1subs = '^'; var expected = '-'; var source = e1.scan(function (acc, x) { return [].concat(acc, x); }, []); expectObservable(source).toBe(expected); expectSubscriptions(e1.subscriptions).toBe(e1subs); }); it('handle throw', function () { var e1 = cold('#'); var e1subs = '(^!)'; var expected = '#'; var source = e1.scan(function (acc, x) { return [].concat(acc, x); }, []); expectObservable(source).toBe(expected); expectSubscriptions(e1.subscriptions).toBe(e1subs); }); it('should allow unsubscribing explicitly and early', function () { var e1 = hot('--a--^--b--c--d--e--f--g--|'); var unsub = ' ! '; var e1subs = '^ ! '; var expected = '---u--v--w--x-- '; var values = { u: ['b'], v: ['b', 'c'], w: ['b', 'c', 'd'], x: ['b', 'c', 'd', 'e'], y: ['b', 'c', 'd', 'e', 'f'], z: ['b', 'c', 'd', 'e', 'f', 'g'] }; var source = e1.scan(function (acc, x) { return [].concat(acc, x); }, []); expectObservable(source, unsub).toBe(expected, values); expectSubscriptions(e1.subscriptions).toBe(e1subs); }); it('should not break unsubscription chains when result is unsubscribed explicitly', function () { var e1 = hot('--a--^--b--c--d--e--f--g--|'); var e1subs = '^ ! '; var expected = '---u--v--w--x-- '; var unsub = ' ! '; var values = { u: ['b'], v: ['b', 'c'], w: ['b', 'c', 'd'], x: ['b', 'c', 'd', 'e'], y: ['b', 'c', 'd', 'e', 'f'], z: ['b', 'c', 'd', 'e', 'f', 'g'] }; var source = e1 .mergeMap(function (x) { return Observable.of(x); }) .scan(function (acc, x) { return [].concat(acc, x); }, []) .mergeMap(function (x) { return Observable.of(x); }); expectObservable(source, unsub).toBe(expected, values); expectSubscriptions(e1.subscriptions).toBe(e1subs); }); it('should pass current index to accumulator', function () { var values = { a: 1, b: 3, c: 5, x: 1, y: 4, z: 9 }; var idx = [0, 1, 2]; var e1 = hot('--a--b--c--|', values); var e1subs = '^ !'; var expected = '--x--y--z--|'; var scanFunction = function (o, value, index) { chai_1.expect(index).to.equal(idx.shift()); return o + value; }; var scan = e1.scan(scanFunction, 0).finally(function () { chai_1.expect(idx).to.be.empty; }); expectObservable(scan).toBe(expected, values); expectSubscriptions(e1.subscriptions).toBe(e1subs); }); it('should accept array typed reducers', function () { type(function () { var a; a.reduce(function (acc, value) { return acc.concat(value); }, []); }); }); it('should accept T typed reducers', function () { type(function () { var a; a.reduce(function (acc, value) { value.a = acc.a; value.b = acc.b; return acc; }, {}); }); }); it('should accept R typed reducers', function () { type(function () { var a; a.reduce(function (acc, value) { value.a = acc.a; value.b = acc.b; return acc; }, {}); }); }); }); //# sourceMappingURL=scan-spec.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>