61 lines
2.1 KiB
JavaScript
61 lines
2.1 KiB
JavaScript
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/** PURE_IMPORTS_START tslib,_Subscriber PURE_IMPORTS_END */
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import * as tslib_1 from "tslib";
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import { Subscriber } from '../Subscriber';
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export function distinctUntilChanged(compare, keySelector) {
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return function (source) { return source.lift(new DistinctUntilChangedOperator(compare, keySelector)); };
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}
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var DistinctUntilChangedOperator = /*@__PURE__*/ (function () {
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function DistinctUntilChangedOperator(compare, keySelector) {
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this.compare = compare;
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this.keySelector = keySelector;
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}
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DistinctUntilChangedOperator.prototype.call = function (subscriber, source) {
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return source.subscribe(new DistinctUntilChangedSubscriber(subscriber, this.compare, this.keySelector));
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};
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return DistinctUntilChangedOperator;
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}());
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var DistinctUntilChangedSubscriber = /*@__PURE__*/ (function (_super) {
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tslib_1.__extends(DistinctUntilChangedSubscriber, _super);
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function DistinctUntilChangedSubscriber(destination, compare, keySelector) {
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var _this = _super.call(this, destination) || this;
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_this.keySelector = keySelector;
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_this.hasKey = false;
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if (typeof compare === 'function') {
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_this.compare = compare;
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}
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return _this;
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}
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DistinctUntilChangedSubscriber.prototype.compare = function (x, y) {
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return x === y;
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};
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DistinctUntilChangedSubscriber.prototype._next = function (value) {
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var key;
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try {
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var keySelector = this.keySelector;
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key = keySelector ? keySelector(value) : value;
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}
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catch (err) {
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return this.destination.error(err);
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}
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var result = false;
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if (this.hasKey) {
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try {
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var compare = this.compare;
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result = compare(this.key, key);
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}
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catch (err) {
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return this.destination.error(err);
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}
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}
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else {
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this.hasKey = true;
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}
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if (!result) {
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this.key = key;
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this.destination.next(value);
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}
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};
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return DistinctUntilChangedSubscriber;
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}(Subscriber));
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//# sourceMappingURL=distinctUntilChanged.js.map
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