@reactivex/ix-esnext-esm/asynciterable/operators/distinctuntilchanged.js

The Interactive Extensions for JavaScript

import { AsyncIterableX } from '../asynciterablex';
import { identityAsync } from '../../util/identity';
import { comparerAsync } from '../../util/comparer';
export class DistinctUntilChangedAsyncIterable extends AsyncIterableX {
    constructor(source, keySelector, comparer) {
        super();
        this._source = source;
        this._keySelector = keySelector;
        this._comparer = comparer;
    }
    async *[Symbol.asyncIterator]() {
        let currentKey;
        let hasCurrentKey = false;
        for await (const item of this._source) {
            const key = await this._keySelector(item);
            let comparerEquals = false;
            if (hasCurrentKey) {
                comparerEquals = await this._comparer(currentKey, key);
            }
            if (!hasCurrentKey || !comparerEquals) {
                hasCurrentKey = true;
                currentKey = key;
                yield item;
            }
        }
    }
}
export function distinctUntilChanged(keySelector = identityAsync, comparer = comparerAsync) {
    return function distinctUntilChangedOperatorFunction(source) {
        return new DistinctUntilChangedAsyncIterable(source, keySelector, comparer);
    };
}

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