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class="source-code line-number raw-source-code"><code class="prettyprint linenums" data-ice="content">import { OuterSubscriber } from '../OuterSubscriber'; import { subscribeToResult } from '../util/subscribeToResult'; import { Set } from '../util/Set'; /** * Returns an Observable that emits all items emitted by the source Observable that are distinct by comparison from previous items. * If a keySelector function is provided, then it will project each value from the source observable into a new value that it will * check for equality with previously projected values. If a keySelector function is not provided, it will use each value from the * source observable directly with an equality check against previous values. * In JavaScript runtimes that support `Set`, this operator will use a `Set` to improve performance of the distinct value checking. * In other runtimes, this operator will use a minimal implementation of `Set` that relies on an `Array` and `indexOf` under the * hood, so performance will degrade as more values are checked for distinction. Even in newer browsers, a long-running `distinct` * use might result in memory leaks. To help alleviate this in some scenarios, an optional `flushes` parameter is also provided so * that the internal `Set` can be "flushed", basically clearing it of values. * @param {function} [keySelector] optional function to select which value you want to check as distinct. * @param {Observable} [flushes] optional Observable for flushing the internal HashSet of the operator. * @return {Observable} an Observable that emits items from the source Observable with distinct values. * @method distinct * @owner Observable */ export function distinct(keySelector, flushes) { return this.lift(new DistinctOperator(keySelector, flushes)); } var DistinctOperator = (function () { function DistinctOperator(keySelector, flushes) { this.keySelector = keySelector; this.flushes = flushes; } DistinctOperator.prototype.call = function (subscriber, source) { return source._subscribe(new DistinctSubscriber(subscriber, this.keySelector, this.flushes)); }; return DistinctOperator; }()); /** * We need this JSDoc comment for affecting ESDoc. * @ignore * @extends {Ignored} */ export var DistinctSubscriber = (function (_super) { __extends(DistinctSubscriber, _super); function DistinctSubscriber(destination, keySelector, flushes) { _super.call(this, destination); this.keySelector = keySelector; this.values = new Set(); if (flushes) { this.add(subscribeToResult(this, flushes)); } } DistinctSubscriber.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex, innerSub) { this.values.clear(); }; DistinctSubscriber.prototype.notifyError = function (error, innerSub) { this._error(error); }; DistinctSubscriber.prototype._next = function (value) { if (this.keySelector) { this._useKeySelector(value); } else { this._finalizeNext(value, value); } }; DistinctSubscriber.prototype._useKeySelector = function (value) { var key; var destination = this.destination; try { key = this.keySelector(value); } catch (err) { destination.error(err); return; } this._finalizeNext(key, value); }; DistinctSubscriber.prototype._finalizeNext = function (key, value) { var values = this.values; if (!values.has(key)) { values.add(key); this.destination.next(value); } }; return DistinctSubscriber; }(OuterSubscriber)); //# sourceMappingURL=distinct.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>