es6/operators/distinctUntilChanged.js

import { Subscriber } from '../Subscriber';
import { tryCatch } from '../util/tryCatch';
import { errorObject } from '../util/errorObject';
/* tslint:enable:max-line-length */
/**
 * Returns an Observable that emits all items emitted by the source Observable that are distinct by comparison from the previous item.
 *
 * If a comparator function is provided, then it will be called for each item to test for whether or not that value should be emitted.
 *
 * If a comparator function is not provided, an equality check is used by default.
 *
 * @example <caption>A simple example with numbers</caption>
 * Observable.of(1, 1, 2, 2, 2, 1, 1, 2, 3, 3, 4)
 *   .distinctUntilChanged()
 *   .subscribe(x => console.log(x)); // 1, 2, 1, 2, 3, 4
 *
 * @example <caption>An example using a compare function</caption>
 * interface Person {
 *    age: number,
 *    name: string
 * }
 *
 * Observable.of<Person>(
 *     { age: 4, name: 'Foo'},
 *     { age: 7, name: 'Bar'},
 *     { age: 5, name: 'Foo'})
 *     { age: 6, name: 'Foo'})
 *     .distinctUntilChanged((p: Person, q: Person) => p.name === q.name)
 *     .subscribe(x => console.log(x));
 *
 * // displays:
 * // { age: 4, name: 'Foo' }
 * // { age: 7, name: 'Bar' }
 * // { age: 5, name: 'Foo' }
 *
 * @see {@link distinct}
 * @see {@link distinctUntilKeyChanged}
 *
 * @param {function} [compare] Optional comparison function called to test if an item is distinct from the previous item in the source.
 * @return {Observable} An Observable that emits items from the source Observable with distinct values.
 * @method distinctUntilChanged
 * @owner Observable
 */
export function distinctUntilChanged(compare, keySelector) {
    return (source) => source.lift(new DistinctUntilChangedOperator(compare, keySelector));
}
class DistinctUntilChangedOperator {
    constructor(compare, keySelector) {
        this.compare = compare;
        this.keySelector = keySelector;
    }
    call(subscriber, source) {
        return source.subscribe(new DistinctUntilChangedSubscriber(subscriber, this.compare, this.keySelector));
    }
}
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
class DistinctUntilChangedSubscriber extends Subscriber {
    constructor(destination, compare, keySelector) {
        super(destination);
        this.keySelector = keySelector;
        this.hasKey = false;
        if (typeof compare === 'function') {
            this.compare = compare;
        }
    }
    compare(x, y) {
        return x === y;
    }
    _next(value) {
        const keySelector = this.keySelector;
        let key = value;
        if (keySelector) {
            key = tryCatch(this.keySelector)(value);
            if (key === errorObject) {
                return this.destination.error(errorObject.e);
            }
        }
        let result = false;
        if (this.hasKey) {
            result = tryCatch(this.compare)(this.key, key);
            if (result === errorObject) {
                return this.destination.error(errorObject.e);
            }
        }
        else {
            this.hasKey = true;
        }
        if (Boolean(result) === false) {
            this.key = key;
            this.destination.next(value);
        }
    }
}
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