@reactivex/ix-es5-esm/iterable/operators/distinct.js

The Interactive Extensions for JavaScript

import { __extends, __generator, __values } from "tslib";
import { IterableX } from '../iterablex.js';
import { identity } from '../../util/identity.js';
import { arrayIndexOf } from '../../util/arrayindexof.js';
import { comparer as defaultComparer } from '../../util/comparer.js';
/** @ignore */
var DistinctIterable = /** @class */ (function (_super) {
    __extends(DistinctIterable, _super);
    function DistinctIterable(source, keySelector, cmp) {
        var _this = _super.call(this) || this;
        _this._source = source;
        _this._keySelector = keySelector;
        _this._cmp = cmp;
        return _this;
    }
    DistinctIterable.prototype[Symbol.iterator] = function () {
        var set, _a, _b, item, key, e_1_1;
        var e_1, _c;
        return __generator(this, function (_d) {
            switch (_d.label) {
                case 0:
                    set = [];
                    _d.label = 1;
                case 1:
                    _d.trys.push([1, 6, 7, 8]);
                    _a = __values(this._source), _b = _a.next();
                    _d.label = 2;
                case 2:
                    if (!!_b.done) return [3 /*break*/, 5];
                    item = _b.value;
                    key = this._keySelector(item);
                    if (!(arrayIndexOf(set, key, this._cmp) === -1)) return [3 /*break*/, 4];
                    set.push(key);
                    return [4 /*yield*/, item];
                case 3:
                    _d.sent();
                    _d.label = 4;
                case 4:
                    _b = _a.next();
                    return [3 /*break*/, 2];
                case 5: return [3 /*break*/, 8];
                case 6:
                    e_1_1 = _d.sent();
                    e_1 = { error: e_1_1 };
                    return [3 /*break*/, 8];
                case 7:
                    try {
                        if (_b && !_b.done && (_c = _a.return)) _c.call(_a);
                    }
                    finally { if (e_1) throw e_1.error; }
                    return [7 /*endfinally*/];
                case 8: return [2 /*return*/];
            }
        });
    };
    return DistinctIterable;
}(IterableX));
export { DistinctIterable };
/**
 * Returns an iterable sequence that contains only distinct elements according to the keySelector and comparer.
 *
 * @template TSource The type of the elements in the source sequence.
 * @template TKey The type of the discriminator key computed for each element in the source sequence.
 * @param {DistinctOptions<TSource, TKey>} [options] The optional arguments for a key selector and comparer function.
 * @returns {MonoTypeOperatorFunction<TSource>} An operator that returns distinct elements according to the keySelector and options.
 */
export function distinct(options) {
    return function distinctOperatorFunction(source) {
        var _a = options || {}, _b = _a["keySelector"], keySelector = _b === void 0 ? identity : _b, _c = _a["comparer"], comparer = _c === void 0 ? defaultComparer : _c;
        return new DistinctIterable(source, keySelector, comparer);
    };
}

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