fast-iterable/dist/recipes/to-map-recipe.js

Provides LINQ-like fluent api operations for iterables and async iterables (ES2018+).

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.toMapRecipe = exports.chooseToMapRecipe = void 0;
const prepare_1 = require("../types-internal/prepare");
function chooseToMapRecipe({ forEach, resolver }) {
    return function distinct(getKey, mapper, choose) {
        const map = new Map();
        return resolver(forEach.call(this, (x) => {
            const k = getKey(x);
            const old = map.get(k);
            const newOne = old === undefined ? mapper(x) : (choose === null || choose === void 0 ? void 0 : choose(old, x)) || old;
            if (old !== newOne) {
                map.set(k, newOne);
            }
        }), () => map);
    };
}
exports.chooseToMapRecipe = chooseToMapRecipe;
function toMapRecipe(ingredients) {
    const choose = chooseToMapRecipe(ingredients);
    return function distinct(getKey, mapper, getReduced) {
        const preparedGetKey = (0, prepare_1.prepare)(getKey);
        const preparedMapper = (0, prepare_1.prepare)(mapper);
        return choose.call(this, preparedGetKey, preparedMapper, getReduced);
    };
}
exports.toMapRecipe = toMapRecipe;