@reactivex/ix-esnext-esm/iterable/operators/distinct.js

The Interactive Extensions for JavaScript

import { IterableX } from '../iterablex';
import { identity } from '../../util/identity';
import { arrayIndexOf } from '../../util/arrayindexof';
import { comparer as defaultComparer } from '../../util/comparer';
export class DistinctIterable extends IterableX {
    constructor(source, keySelector, cmp) {
        super();
        this._source = source;
        this._keySelector = keySelector;
        this._cmp = cmp;
    }
    *[Symbol.iterator]() {
        const set = [];
        for (const item of this._source) {
            const key = this._keySelector(item);
            if (arrayIndexOf(set, key, this._cmp) === -1) {
                set.push(key);
                yield item;
            }
        }
    }
}
export function distinct(keySelector = identity, comparer = defaultComparer) {
    return function distinctOperatorFunction(source) {
        return new DistinctIterable(source, keySelector, comparer);
    };
}

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