Александр

const foo = {
    bar: t => t * 2,
    baz: {
        biz(a) { return this.bar(a) }
    }
};

arr.reduce((acc, x) => ((acc[x.i] ??= []).push(x), acc), {})

const mapOptions = (options, values) => option.map(({ option }) => {
    const usedValues = new Set();
    return {
        id: option.id,
        name: option.name,
        slug: option.slug,
        values: values.reduce((acc, { id, value }) => {
            if (id === option.id && !usedValues.has(value)) {
                usedValues.add(value);
                acc.push({ id, value });
            }

            return acc;
        }, [])
    };
});

console.log(mapOptions(options, option_values));

const filterBy = (collection, condition) => {
    const keys = Object.keys(condition);
    return collection.filter((entry) => keys.every((key) => entry[key] >= condition[key]));
};

const result = filterBy(arr, { e: 1, c: 2 });

- if (numberTest && emailTest && adressTest) {
+ if (numberTest() && emailTest() && adressTest()) {

1. IIFE
   
2. ES6 модули
   
3. Различные другие системы модулей: SystemJs, AMD
   

document.querySelectorAll('.group').forEach((group) => {
    const text = group.textContent.trim();
    if (students.includes(text)) {
        group.style.setProperty('background-color', '#AA0000');
    }
    if (prepods.includes(text)) {
        group.style.setProperty('background-color', '#00FF00');
    }
});

names.findIndex((values) => values.some((value) => value === 'George S'))

Object.fromEntries(new FormData(document.querySelector('form')).entries());

const arr1 = ['Андрей', 'Алексей', 'Сергей', 'Антон', 'Матвей', 'Роман', 'Руслан'];
const arr2 = [27, 22, 38, 45, 51, 42, 19];

const data = Object.fromEntries(
	Array.from({ length: Math.min(arr1.length, arr2.length) }, (_, i) => [arr1[i], arr2[i]])
);

const zip = (...arrays) => {
    const count = arrays.length;
    return Array.from(
        { length: Math.min(...arrays.map((array) => array.length)) },
        (_, i) => Array.from({ length: count }, (_, j) => arrays[j][i])
    );
};

const arr1 = ['Андрей', 'Алексей', 'Сергей', 'Антон', 'Матвей', 'Роман', 'Руслан'];
const arr2 = [27, 22, 38, 45, 51, 42, 19];

const data = Object.fromEntries(zip(arr1, arr2));
const sortedData = Object.fromEntries(zip(arr1, arr2).sort((a, b) => a[1] - b[1]));
console.log(sortedData); // {Руслан: 19, Алексей: 22, Андрей: 27, Сергей: 38, Роман: 42,…}