lazzy.ts/generators/distinct.js

Fast and lightweight library for lazy operations with iterable objects.

"use strict";
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
    function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
    return new (P || (P = Promise))(function (resolve, reject) {
        function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
        function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
        function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
        step((generator = generator.apply(thisArg, _arguments || [])).next());
    });
};
var __await = (this && this.__await) || function (v) { return this instanceof __await ? (this.v = v, this) : new __await(v); }
var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _arguments, generator) {
    if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
    var g = generator.apply(thisArg, _arguments || []), i, q = [];
    return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
    function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
    function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
    function fulfill(value) { resume("next", value); }
    function reject(value) { resume("throw", value); }
    function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.distinctAsync = exports.getPrimitiveSelectorAsync = exports.distinct = exports.getPrimitiveSelector = void 0;
const helpers_1 = require("../common/helpers");
function getPrimitiveSelector(value, ...select) {
    if (helpers_1.isPrimitive(value)) {
        return (v) => v;
    }
    if (select[0] !== undefined) {
        return select[0];
    }
    throw new TypeError(helpers_1.InvalidArgumentsMessage);
}
exports.getPrimitiveSelector = getPrimitiveSelector;
function* distinct(iterator, ...select) {
    let x = iterator.next();
    if (x.done === true) {
        return x.value;
    }
    const selector = getPrimitiveSelector(x.value, ...select);
    const already = new Set();
    while (x.done !== true) {
        const value = selector(x.value);
        if (!already.has(value)) {
            already.add(value);
            yield x.value;
        }
        x = iterator.next();
    }
    return x.value;
}
exports.distinct = distinct;
function getPrimitiveSelectorAsync(value, ...select) {
    return __awaiter(this, void 0, void 0, function* () {
        if (helpers_1.isPrimitive(yield Promise.resolve(value))) {
            return (v) => v;
        }
        if (select[0] !== undefined) {
            return select[0];
        }
        throw new TypeError(helpers_1.InvalidArgumentsMessage);
    });
}
exports.getPrimitiveSelectorAsync = getPrimitiveSelectorAsync;
function distinctAsync(iterator, ...select) {
    return __asyncGenerator(this, arguments, function* distinctAsync_1() {
        let x = yield __await(iterator.next());
        if (x.done === true) {
            return yield __await(x.value);
        }
        const selector = yield __await(getPrimitiveSelectorAsync(x.value, ...select));
        const already = new Set();
        while (x.done !== true) {
            const value = selector(yield __await(Promise.resolve(x.value)));
            if (!already.has(value)) {
                already.add(value);
                yield yield __await(x.value);
            }
            x = yield __await(iterator.next());
        }
        return yield __await(x.value);
    });
}
exports.distinctAsync = distinctAsync;
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