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data-ice="title">spec-js/operators/skipWhile-spec.js</h1> <pre class="source-code line-number raw-source-code"><code class="prettyprint linenums" data-ice="content">&quot;use strict&quot;; var chai_1 = require(&apos;chai&apos;); var Rx = require(&apos;../../dist/cjs/Rx&apos;); var Observable = Rx.Observable; /** @test {skipWhile} */ describe(&apos;Observable.prototype.skipWhile&apos;, function () { asDiagram(&apos;skipWhile(x =&gt; x &lt; 4)&apos;)(&apos;should skip all elements until predicate is false&apos;, function () { var source = hot(&apos;-1-^2--3--4--5--6--|&apos;); var sourceSubs = &apos;^ !&apos;; var expected = &apos;-------4--5--6--|&apos;; var predicate = function (v) { return +v &lt; 4; }; expectObservable(source.skipWhile(predicate)).toBe(expected); expectSubscriptions(source.subscriptions).toBe(sourceSubs); }); it(&apos;should skip all elements with a true predicate&apos;, function () { var source = hot(&apos;-1-^2--3--4--5--6--|&apos;); var sourceSubs = &apos;^ !&apos;; var expected = &apos;----------------|&apos;; expectObservable(source.skipWhile(function () { return true; })).toBe(expected); expectSubscriptions(source.subscriptions).toBe(sourceSubs); }); it(&apos;should skip all elements with a truthy predicate&apos;, function () { var source = hot(&apos;-1-^2--3--4--5--6--|&apos;); var sourceSubs = &apos;^ !&apos;; var expected = &apos;----------------|&apos;; expectObservable(source.skipWhile(function () { return {}; })).toBe(expected); expectSubscriptions(source.subscriptions).toBe(sourceSubs); }); it(&apos;should not skip any element with a false predicate&apos;, function () { var source = hot(&apos;-1-^2--3--4--5--6--|&apos;); var sourceSubs = &apos;^ !&apos;; var expected = &apos;-2--3--4--5--6--|&apos;; expectObservable(source.skipWhile(function () { return false; })).toBe(expected); expectSubscriptions(source.subscriptions).toBe(sourceSubs); }); it(&apos;should not skip any elements with a falsy predicate&apos;, function () { var source = hot(&apos;-1-^2--3--4--5--6--|&apos;); var sourceSubs = &apos;^ !&apos;; var expected = &apos;-2--3--4--5--6--|&apos;; expectObservable(source.skipWhile(function () { return undefined; })).toBe(expected); expectSubscriptions(source.subscriptions).toBe(sourceSubs); }); it(&apos;should skip elements on hot source&apos;, function () { var source = hot(&apos;--1--2-^-3--4--5--6--7--8--&apos;); var sourceSubs = &apos;^ &apos;; var expected = &apos;--------5--6--7--8--&apos;; var predicate = function (v) { return +v &lt; 5; }; expectObservable(source.skipWhile(predicate)).toBe(expected); expectSubscriptions(source.subscriptions).toBe(sourceSubs); }); it(&apos;should be possible to skip using the element\&apos;s index&apos;, function () { var source = hot(&apos;--a--b-^-c--d--e--f--g--h--|&apos;); var sourceSubs = &apos;^ !&apos;; var expected = &apos;--------e--f--g--h--|&apos;; var predicate = function (v, index) { return index &lt; 2; }; expectObservable(source.skipWhile(predicate)).toBe(expected); expectSubscriptions(source.subscriptions).toBe(sourceSubs); }); it(&apos;should skip using index with source unsubscribes early&apos;, function () { var source = hot(&apos;--a--b-^-c--d--e--f--g--h--|&apos;); var sourceSubs = &apos;^ !&apos;; var unsub = &apos;-----------!&apos;; var expected = &apos;-----d--e---&apos;; var predicate = function (v, index) { return index &lt; 1; }; expectObservable(source.skipWhile(predicate), unsub).toBe(expected); expectSubscriptions(source.subscriptions).toBe(sourceSubs); }); it(&apos;should not break unsubscription chains when result is unsubscribed explicitly&apos;, function () { var source = hot(&apos;--a--b-^-c--d--e--f--g--h--|&apos;); var sourceSubs = &apos;^ !&apos;; var expected = &apos;-----d--e---&apos;; var unsub = &apos; !&apos;; var predicate = function (v, index) { return index &lt; 1; }; var result = source .mergeMap(function (x) { return Observable.of(x); }) .skipWhile(predicate) .mergeMap(function (x) { return Observable.of(x); }); expectObservable(result, unsub).toBe(expected); expectSubscriptions(source.subscriptions).toBe(sourceSubs); }); it(&apos;should skip using value with source throws&apos;, function () { var source = hot(&apos;--a--b-^-c--d--e--f--g--h--#&apos;); var sourceSubs = &apos;^ !&apos;; var expected = &apos;-----d--e--f--g--h--#&apos;; var predicate = function (v) { return v !== &apos;d&apos;; }; expectObservable(source.skipWhile(predicate)).toBe(expected); expectSubscriptions(source.subscriptions).toBe(sourceSubs); }); it(&apos;should invoke predicate while its false and never again&apos;, function () { var source = hot(&apos;--a--b-^-c--d--e--f--g--h--|&apos;); var sourceSubs = &apos;^ !&apos;; var expected = &apos;--------e--f--g--h--|&apos;; var invoked = 0; var predicate = function (v) { invoked++; return v !== &apos;e&apos;; }; expectObservable(source.skipWhile(predicate).do(null, null, function () { chai_1.expect(invoked).to.equal(3); })).toBe(expected); expectSubscriptions(source.subscriptions).toBe(sourceSubs); }); it(&apos;should handle predicate that throws&apos;, function () { var source = hot(&apos;--a--b-^-c--d--e--f--g--h--|&apos;); var sourceSubs = &apos;^ !&apos;; var expected = &apos;--------#&apos;; var predicate = function (v) { if (v === &apos;e&apos;) { throw new Error(&apos;nom d\&apos;une pipe !&apos;); } return v !== &apos;f&apos;; }; expectObservable(source.skipWhile(predicate)).toBe(expected, undefined, new Error(&apos;nom d\&apos;une pipe !&apos;)); expectSubscriptions(source.subscriptions).toBe(sourceSubs); }); it(&apos;should handle Observable.empty&apos;, function () { var source = cold(&apos;|&apos;); var subs = &apos;(^!)&apos;; var expected = &apos;|&apos;; expectObservable(source.skipWhile(function () { return true; })).toBe(expected); expectSubscriptions(source.subscriptions).toBe(subs); }); it(&apos;should handle Observable.never&apos;, function () { var source = cold(&apos;-&apos;); var subs = &apos;^&apos;; var expected = &apos;-&apos;; expectObservable(source.skipWhile(function () { return true; })).toBe(expected); expectSubscriptions(source.subscriptions).toBe(subs); }); it(&apos;should handle Observable.throw&apos;, function () { var source = cold(&apos;#&apos;); var subs = &apos;(^!)&apos;; var expected = &apos;#&apos;; expectObservable(source.skipWhile(function () { return true; })).toBe(expected); expectSubscriptions(source.subscriptions).toBe(subs); }); }); //# sourceMappingURL=skipWhile-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> 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