@codibre/fluent-iterable/dist/recipes/filter-recipe.js

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

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.filterRecipe = filterRecipe;
const types_internal_1 = require("../types-internal");
const prepare_1 = require("../types-internal/prepare");
const utils_1 = require("../utils");
const augment_iterable_recipe_1 = require("./augment-iterable-recipe");
function filterRecipe(filterIterable, takeWhileIterable, resolver) {
    const baseFilter = (0, augment_iterable_recipe_1.augmentIterableRecipe)(filterIterable);
    const takeWhile = (0, augment_iterable_recipe_1.augmentIterableRecipe)(takeWhileIterable);
    return function (basePredicate = utils_1.identity) {
        const predicate = (0, prepare_1.prepare)(basePredicate);
        if ((0, types_internal_1.isAnyOrderAssured)(predicate, this)) {
            let alreadyTrue = false;
            let lastResult = false;
            const takeWhilePredicate = (t) => resolver(predicate(t), (result) => {
                alreadyTrue = alreadyTrue || result;
                lastResult = result;
                return !alreadyTrue || lastResult;
            });
            const action = () => lastResult;
            return (0, types_internal_1.keepOrderAssuring)(baseFilter.call(takeWhile.call(this, takeWhilePredicate), action), this);
        }
        return baseFilter.call(this, predicate);
    };
}