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data-ice="title">spec-js/operators/combineLatest-spec.js</h1> <pre class="source-code line-number raw-source-code"><code class="prettyprint linenums" data-ice="content">&quot;use strict&quot;; var Rx = require(&apos;../../dist/cjs/Rx&apos;); var Observable = Rx.Observable; /** @test {combineLatest} */ describe(&apos;Observable.prototype.combineLatest&apos;, function () { asDiagram(&apos;combineLatest&apos;)(&apos;should combine events from two cold observables&apos;, function () { var e1 = cold(&apos;-a--b-----c-d-e-|&apos;); var e2 = cold(&apos;--1--2-3-4---| &apos;); var expected = &apos;--A-BC-D-EF-G-H-|&apos;; var result = e1.combineLatest(e2, function (a, b) { return String(a) + String(b); }); expectObservable(result).toBe(expected, { A: &apos;a1&apos;, B: &apos;b1&apos;, C: &apos;b2&apos;, D: &apos;b3&apos;, E: &apos;b4&apos;, F: &apos;c4&apos;, G: &apos;d4&apos;, H: &apos;e4&apos; }); }); it(&apos;should work with two nevers&apos;, function () { var e1 = cold(&apos;-&apos;); var e1subs = &apos;^&apos;; var e2 = cold(&apos;-&apos;); var e2subs = &apos;^&apos;; var expected = &apos;-&apos;; var result = e1.combineLatest(e2, function (x, y) { return x + y; }); expectObservable(result).toBe(expected); expectSubscriptions(e1.subscriptions).toBe(e1subs); expectSubscriptions(e2.subscriptions).toBe(e2subs); }); it(&apos;should work with never and empty&apos;, function () { var e1 = cold(&apos;-&apos;); var e1subs = &apos;^&apos;; var e2 = cold(&apos;|&apos;); var e2subs = &apos;(^!)&apos;; var expected = &apos;-&apos;; var result = e1.combineLatest(e2, function (x, y) { return x + y; }); expectObservable(result).toBe(expected); expectSubscriptions(e1.subscriptions).toBe(e1subs); expectSubscriptions(e2.subscriptions).toBe(e2subs); }); it(&apos;should work with empty and never&apos;, function () { var e1 = cold(&apos;|&apos;); var e1subs = &apos;(^!)&apos;; var e2 = cold(&apos;-&apos;); var e2subs = &apos;^&apos;; var expected = &apos;-&apos;; var result = e1.combineLatest(e2, function (x, y) { return x + y; }); expectObservable(result).toBe(expected); expectSubscriptions(e1.subscriptions).toBe(e1subs); expectSubscriptions(e2.subscriptions).toBe(e2subs); }); it(&apos;should work with empty and empty&apos;, function () { var e1 = cold(&apos;|&apos;); var e1subs = &apos;(^!)&apos;; var e2 = cold(&apos;|&apos;); var e2subs = &apos;(^!)&apos;; var expected = &apos;|&apos;; var result = e1.combineLatest(e2, function (x, y) { return x + y; }); expectObservable(result).toBe(expected); expectSubscriptions(e1.subscriptions).toBe(e1subs); expectSubscriptions(e2.subscriptions).toBe(e2subs); }); it(&apos;should work with hot-empty and hot-single&apos;, function () { var values = { a: 1, b: 2, c: 3, r: 1 + 3 //a + c }; var e1 = hot(&apos;-a-^-|&apos;, values); var e1subs = &apos;^ !&apos;; var e2 = hot(&apos;-b-^-c-|&apos;, values); var e2subs = &apos;^ !&apos;; var expected = &apos;----|&apos;; var result = e1.combineLatest(e2, function (x, y) { return x + y; }); expectObservable(result).toBe(expected, values); expectSubscriptions(e1.subscriptions).toBe(e1subs); expectSubscriptions(e2.subscriptions).toBe(e2subs); }); it(&apos;should work with hot-single and hot-empty&apos;, function () { var values = { a: 1, b: 2, c: 3 }; var e1 = hot(&apos;-a-^-|&apos;, values); var e1subs = &apos;^ !&apos;; var e2 = hot(&apos;-b-^-c-|&apos;, values); var e2subs = &apos;^ !&apos;; var expected = &apos;----|&apos;; var result = e2.combineLatest(e1, function (x, y) { return x + y; }); expectObservable(result).toBe(expected, values); expectSubscriptions(e1.subscriptions).toBe(e1subs); expectSubscriptions(e2.subscriptions).toBe(e2subs); }); it(&apos;should work with hot-single and never&apos;, function () { var values = { a: 1 }; var e1 = hot(&apos;-a-^-|&apos;, values); var e1subs = &apos;^ !&apos;; var e2 = hot(&apos;------&apos;, values); //never var e2subs = &apos;^ &apos;; var expected = &apos;-&apos;; //never var result = e1.combineLatest(e2, function (x, y) { return x + y; }); expectObservable(result).toBe(expected, values); expectSubscriptions(e1.subscriptions).toBe(e1subs); expectSubscriptions(e2.subscriptions).toBe(e2subs); }); it(&apos;should work with never and hot-single&apos;, function () { var values = { a: 1, b: 2 }; var e1 = hot(&apos;--------&apos;, values); //never var e1subs = &apos;^ &apos;; var e2 = hot(&apos;-a-^-b-|&apos;, values); var e2subs = &apos;^ !&apos;; var expected = &apos;-----&apos;; //never var result = e1.combineLatest(e2, function (x, y) { return x + y; }); expectObservable(result).toBe(expected, values); expectSubscriptions(e1.subscriptions).toBe(e1subs); expectSubscriptions(e2.subscriptions).toBe(e2subs); }); it(&apos;should work with hot and hot&apos;, function () { var e1 = hot(&apos;--a--^--b--c--|&apos;, { a: &apos;a&apos;, b: &apos;b&apos;, c: &apos;c&apos; }); var e1subs = &apos;^ !&apos;; var e2 = hot(&apos;---e-^---f--g--|&apos;, { e: &apos;e&apos;, f: &apos;f&apos;, g: &apos;g&apos; }); var e2subs = &apos;^ !&apos;; var expected = &apos;----x-yz--|&apos;; var result = e1.combineLatest(e2, function (x, y) { return x + y; }); expectObservable(result).toBe(expected, { x: &apos;bf&apos;, y: &apos;cf&apos;, z: &apos;cg&apos; }); expectSubscriptions(e1.subscriptions).toBe(e1subs); expectSubscriptions(e2.subscriptions).toBe(e2subs); }); it(&apos;should accept array of observables&apos;, function () { var e1 = hot(&apos;--a--^--b--c--|&apos;); var e1subs = &apos;^ !&apos;; var e2 = hot(&apos;---e-^---f--g--|&apos;); var e2subs = &apos;^ !&apos;; var e3 = hot(&apos;---h-^----i--j-|&apos;); var e3subs = &apos;^ !&apos;; var expected = &apos;-----wxyz-|&apos;; var result = e1.combineLatest([e2, e3], function (x, y, z) { return x + y + z; }); expectObservable(result).toBe(expected, { w: &apos;bfi&apos;, x: &apos;cfi&apos;, y: &apos;cgi&apos;, z: &apos;cgj&apos; }); expectSubscriptions(e1.subscriptions).toBe(e1subs); expectSubscriptions(e2.subscriptions).toBe(e2subs); expectSubscriptions(e3.subscriptions).toBe(e3subs); }); it(&apos;should work with empty and error&apos;, function () { var e1 = hot(&apos;----------|&apos;); //empty var e1subs = &apos;^ !&apos;; var e2 = hot(&apos;------#&apos;, null, &apos;shazbot!&apos;); //error var e2subs = &apos;^ !&apos;; var expected = &apos;------#&apos;; var result = e1.combineLatest(e2, function (x, y) { return x + y; }); expectObservable(result).toBe(expected, null, &apos;shazbot!&apos;); expectSubscriptions(e1.subscriptions).toBe(e1subs); expectSubscriptions(e2.subscriptions).toBe(e2subs); }); it(&apos;should work with error and empty&apos;, function () { var e1 = hot(&apos;--^---#&apos;, null, &apos;too bad, honk&apos;); //error var e1subs = &apos;^ !&apos;; var e2 = hot(&apos;--^--------|&apos;); //empty var e2subs = &apos;^ !&apos;; var expected = &apos;----#&apos;; var result = e1.combineLatest(e2, function (x, y) { return x + y; }); expectObservable(result).toBe(expected, null, &apos;too bad, honk&apos;); expectSubscriptions(e1.subscriptions).toBe(e1subs); expectSubscriptions(e2.subscriptions).toBe(e2subs); }); it(&apos;should work with hot and throw&apos;, function () { var e1 = hot(&apos;-a-^--b--c--|&apos;, { a: 1, b: 2, c: 3 }); var e1subs = &apos;^ !&apos;; var e2 = hot(&apos;---^-#&apos;, null, &apos;bazinga&apos;); var e2subs = &apos;^ !&apos;; var expected = &apos;--#&apos;; var result = e1.combineLatest(e2, function (x, y) { return x + y; }); expectObservable(result).toBe(expected, null, &apos;bazinga&apos;); expectSubscriptions(e1.subscriptions).toBe(e1subs); expectSubscriptions(e2.subscriptions).toBe(e2subs); }); it(&apos;should work with throw and hot&apos;, function () { var e1 = hot(&apos;---^-#&apos;, null, &apos;bazinga&apos;); var e1subs = &apos;^ !&apos;; var e2 = hot(&apos;-a-^--b--c--|&apos;, { a: 1, b: 2, c: 3 }); var e2subs = &apos;^ !&apos;; var expected = &apos;--#&apos;; var result = e1.combineLatest(e2, function (x, y) { return x + y; }); expectObservable(result).toBe(expected, null, &apos;bazinga&apos;); expectSubscriptions(e1.subscriptions).toBe(e1subs); expectSubscriptions(e2.subscriptions).toBe(e2subs); }); it(&apos;should work with throw and throw&apos;, function () { var e1 = hot(&apos;---^----#&apos;, null, &apos;jenga&apos;); var e1subs = &apos;^ !&apos;; var e2 = hot(&apos;---^-#&apos;, null, &apos;bazinga&apos;); var e2subs = &apos;^ !&apos;; var expected = &apos;--#&apos;; var result = e1.combineLatest(e2, function (x, y) { return x + y; }); expectObservable(result).toBe(expected, null, &apos;bazinga&apos;); expectSubscriptions(e1.subscriptions).toBe(e1subs); expectSubscriptions(e2.subscriptions).toBe(e2subs); }); it(&apos;should work with error and throw&apos;, function () { var e1 = hot(&apos;-a-^--b--#&apos;, { a: 1, b: 2 }, &apos;wokka wokka&apos;); var e1subs = &apos;^ !&apos;; var e2 = hot(&apos;---^-#&apos;, null, &apos;flurp&apos;); var e2subs = &apos;^ !&apos;; var expected = &apos;--#&apos;; var result = e1.combineLatest(e2, function (x, y) { return x + y; }); expectObservable(result).toBe(expected, null, &apos;flurp&apos;); expectSubscriptions(e1.subscriptions).toBe(e1subs); expectSubscriptions(e2.subscriptions).toBe(e2subs); }); it(&apos;should work with throw and error&apos;, function () { var e1 = hot(&apos;---^-#&apos;, null, &apos;flurp&apos;); var e1subs = &apos;^ !&apos;; var e2 = hot(&apos;-a-^--b--#&apos;, { a: 1, b: 2 }, &apos;wokka wokka&apos;); var e2subs = &apos;^ !&apos;; var expected = &apos;--#&apos;; var result = e1.combineLatest(e2, function (x, y) { return x + y; }); expectObservable(result).toBe(expected, null, &apos;flurp&apos;); expectSubscriptions(e1.subscriptions).toBe(e1subs); expectSubscriptions(e2.subscriptions).toBe(e2subs); }); it(&apos;should work with never and throw&apos;, function () { var e1 = hot(&apos;---^-----------&apos;); var e1subs = &apos;^ !&apos;; var e2 = hot(&apos;---^-----#&apos;, null, &apos;wokka wokka&apos;); var e2subs = &apos;^ !&apos;; var expected = &apos;------#&apos;; var result = e1.combineLatest(e2, function (x, y) { return x + y; }); expectObservable(result).toBe(expected, null, &apos;wokka wokka&apos;); expectSubscriptions(e1.subscriptions).toBe(e1subs); expectSubscriptions(e2.subscriptions).toBe(e2subs); }); it(&apos;should work with throw and never&apos;, function () { var e1 = hot(&apos;---^----#&apos;, null, &apos;wokka wokka&apos;); var e1subs = &apos;^ !&apos;; var e2 = hot(&apos;---^-----------&apos;); var e2subs = &apos;^ !&apos;; var expected = &apos;-----#&apos;; var result = e1.combineLatest(e2, function (x, y) { return x + y; }); expectObservable(result).toBe(expected, null, &apos;wokka wokka&apos;); expectSubscriptions(e1.subscriptions).toBe(e1subs); expectSubscriptions(e2.subscriptions).toBe(e2subs); }); it(&apos;should work with some and throw&apos;, function () { var e1 = hot(&apos;---^----a---b--|&apos;, { a: 1, b: 2 }); var e1subs = &apos;^ !&apos;; var e2 = hot(&apos;---^--#&apos;, null, &apos;wokka wokka&apos;); var e2subs = &apos;^ !&apos;; var expected = &apos;---#&apos;; var result = e1.combineLatest(e2, function (x, y) { return x + y; }); expectObservable(result).toBe(expected, { a: 1, b: 2 }, &apos;wokka wokka&apos;); expectSubscriptions(e1.subscriptions).toBe(e1subs); expectSubscriptions(e2.subscriptions).toBe(e2subs); }); it(&apos;should work with throw and some&apos;, function () { var e1 = hot(&apos;---^--#&apos;, null, &apos;wokka wokka&apos;); var e1subs = &apos;^ !&apos;; var e2 = hot(&apos;---^----a---b--|&apos;, { a: 1, b: 2 }); var e2subs = &apos;^ !&apos;; var expected = &apos;---#&apos;; var result = e1.combineLatest(e2, function (x, y) { return x + y; }); expectObservable(result).toBe(expected, { a: 1, b: 2 }, &apos;wokka wokka&apos;); expectSubscriptions(e1.subscriptions).toBe(e1subs); expectSubscriptions(e2.subscriptions).toBe(e2subs); }); it(&apos;should handle throw after complete left&apos;, function () { var left = hot(&apos;--a--^--b---|&apos;, { a: 1, b: 2 }); var leftSubs = &apos;^ !&apos;; var right = hot(&apos;-----^--------#&apos;, null, &apos;bad things&apos;); var rightSubs = &apos;^ !&apos;; var expected = &apos;---------#&apos;; var result = left.combineLatest(right, function (x, y) { return x + y; }); expectObservable(result).toBe(expected, null, &apos;bad things&apos;); expectSubscriptions(left.subscriptions).toBe(leftSubs); expectSubscriptions(right.subscriptions).toBe(rightSubs); }); it(&apos;should handle throw after complete right&apos;, function () { var left = hot(&apos;-----^--------#&apos;, null, &apos;bad things&apos;); var leftSubs = &apos;^ !&apos;; var right = hot(&apos;--a--^--b---|&apos;, { a: 1, b: 2 }); var rightSubs = &apos;^ !&apos;; var expected = &apos;---------#&apos;; var result = left.combineLatest(right, function (x, y) { return x + y; }); expectObservable(result).toBe(expected, null, &apos;bad things&apos;); expectSubscriptions(left.subscriptions).toBe(leftSubs); expectSubscriptions(right.subscriptions).toBe(rightSubs); }); it(&apos;should handle interleaved with tail&apos;, function () { var e1 = hot(&apos;-a--^--b---c---|&apos;, { a: &apos;a&apos;, b: &apos;b&apos;, c: &apos;c&apos; }); var e1subs = &apos;^ !&apos;; var e2 = hot(&apos;--d-^----e---f--|&apos;, { d: &apos;d&apos;, e: &apos;e&apos;, f: &apos;f&apos; }); var e2subs = &apos;^ !&apos;; var expected = &apos;-----x-y-z--|&apos;; var result = e1.combineLatest(e2, function (x, y) { return x + y; }); expectObservable(result).toBe(expected, { x: &apos;be&apos;, y: &apos;ce&apos;, z: &apos;cf&apos; }); expectSubscriptions(e1.subscriptions).toBe(e1subs); expectSubscriptions(e2.subscriptions).toBe(e2subs); }); it(&apos;should handle two consecutive hot observables&apos;, function () { var e1 = hot(&apos;--a--^--b--c--|&apos;, { a: &apos;a&apos;, b: &apos;b&apos;, c: &apos;c&apos; }); var e1subs = &apos;^ !&apos;; var e2 = hot(&apos;-----^----------d--e--f--|&apos;, { d: &apos;d&apos;, e: &apos;e&apos;, f: &apos;f&apos; }); var e2subs = &apos;^ !&apos;; var expected = &apos;-----------x--y--z--|&apos;; var result = e1.combineLatest(e2, function (x, y) { return x + y; }); expectObservable(result).toBe(expected, { x: &apos;cd&apos;, y: &apos;ce&apos;, z: &apos;cf&apos; }); expectSubscriptions(e1.subscriptions).toBe(e1subs); expectSubscriptions(e2.subscriptions).toBe(e2subs); }); it(&apos;should handle two consecutive hot observables with error left&apos;, function () { var left = hot(&apos;--a--^--b--c--#&apos;, { a: &apos;a&apos;, b: &apos;b&apos;, c: &apos;c&apos; }, &apos;jenga&apos;); var leftSubs = &apos;^ !&apos;; var right = hot(&apos;-----^----------d--e--f--|&apos;, { d: &apos;d&apos;, e: &apos;e&apos;, f: &apos;f&apos; }); var rightSubs = &apos;^ !&apos;; var expected = &apos;---------#&apos;; var result = left.combineLatest(right, function (x, y) { return x + y; }); expectObservable(result).toBe(expected, null, &apos;jenga&apos;); expectSubscriptions(left.subscriptions).toBe(leftSubs); expectSubscriptions(right.subscriptions).toBe(rightSubs); }); it(&apos;should handle two consecutive hot observables with error right&apos;, function () { var left = hot(&apos;--a--^--b--c--|&apos;, { a: &apos;a&apos;, b: &apos;b&apos;, c: &apos;c&apos; }); var leftSubs = &apos;^ !&apos;; var right = hot(&apos;-----^----------d--e--f--#&apos;, { d: &apos;d&apos;, e: &apos;e&apos;, f: &apos;f&apos; }, &apos;dun dun dun&apos;); var rightSubs = &apos;^ !&apos;; var expected = &apos;-----------x--y--z--#&apos;; var result = left.combineLatest(right, function (x, y) { return x + y; }); expectObservable(result).toBe(expected, { x: &apos;cd&apos;, y: &apos;ce&apos;, z: &apos;cf&apos; }, &apos;dun dun dun&apos;); expectSubscriptions(left.subscriptions).toBe(leftSubs); expectSubscriptions(right.subscriptions).toBe(rightSubs); }); it(&apos;should handle selector throwing&apos;, function () { var e1 = hot(&apos;--a--^--b--|&apos;, { a: 1, b: 2 }); var e1subs = &apos;^ !&apos;; var e2 = hot(&apos;--c--^--d--|&apos;, { c: 3, d: 4 }); var e2subs = &apos;^ !&apos;; var expected = &apos;---#&apos;; var result = e1.combineLatest(e2, function (x, y) { throw &apos;ha ha &apos; + x + &apos;, &apos; + y; }); expectObservable(result).toBe(expected, null, &apos;ha ha 2, 4&apos;); expectSubscriptions(e1.subscriptions).toBe(e1subs); expectSubscriptions(e2.subscriptions).toBe(e2subs); }); it(&apos;should allow unsubscribing early and explicitly&apos;, function () { var e1 = hot(&apos;--a--^--b--c---d-| &apos;); var e1subs = &apos;^ ! &apos;; var e2 = hot(&apos;---e-^---f--g---h-|&apos;); var e2subs = &apos;^ ! &apos;; var expected = &apos;----x-yz-- &apos;; var unsub = &apos; ! &apos;; var values = { x: &apos;bf&apos;, y: &apos;cf&apos;, z: &apos;cg&apos; }; var result = e1.combineLatest(e2, function (x, y) { return x + y; }); expectObservable(result, unsub).toBe(expected, values); expectSubscriptions(e1.subscriptions).toBe(e1subs); expectSubscriptions(e2.subscriptions).toBe(e2subs); }); it(&apos;should not break unsubscription chains when unsubscribed explicitly&apos;, function () { var e1 = hot(&apos;--a--^--b--c---d-| &apos;); var e1subs = &apos;^ ! &apos;; var e2 = hot(&apos;---e-^---f--g---h-|&apos;); var e2subs = &apos;^ ! &apos;; var expected = &apos;----x-yz-- &apos;; var unsub = &apos; ! &apos;; var values = { x: &apos;bf&apos;, y: &apos;cf&apos;, z: &apos;cg&apos; }; var result = e1 .mergeMap(function (x) { return Observable.of(x); }) .combineLatest(e2, function (x, y) { return x + y; }) .mergeMap(function (x) { return Observable.of(x); }); expectObservable(result, unsub).toBe(expected, values); expectSubscriptions(e1.subscriptions).toBe(e1subs); expectSubscriptions(e2.subscriptions).toBe(e2subs); }); it(&apos;should emit unique array instances with the default projection&apos;, function () { var e1 = hot(&apos;-a--b--|&apos;); var e2 = hot(&apos;--1--2-|&apos;); var expected = &apos;-------(c|)&apos;; var result = e1.combineLatest(e2).distinct().count(); expectObservable(result).toBe(expected, { c: 3 }); }); }); //# sourceMappingURL=combineLatest-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>