Елена

function ab() {
  let a = 0;
  let b = 1
  return [a, b];
}

let [a, b] = ab();
console.log(a, b);

function ab() {
  let a = 0;
  let b = 1
  return [a, b];

function ab() {
  let a = 0;
  let b = 1
  return {
      a,
      b
  };

Только я не понимаю, если будет две формы,

const prostoClass1 = new ProstoClass(form1);
const prostoClass2 = new ProstoClass(form2);

Array.from(document.querySelectorAll('input')).every(v => v.value)

validationButtonForme(titleCard, linkImage, popupButtonAdd);

() => {
    if (inputOne.value.length && inputTwo.value.length) {
      enbableButton(button2);
    } else {
      disabledButton(button2);
    }
  }

validationButtonForme(titleCard, linkImage, popupButtonAdd)();

function itemFactory(param1, param) {
  return function item(event) {
    // param1 and param2 are available here
  }
}

document.addEventListener('input', itemFactory(true, 50));

const input = document.querySelector("input");
const button = document.querySelector("button");

button.disabled = true;

input.addEventListener("input", function() {
  button.disabled = !this.value.length;
})