❓Что будет на выходе?

const weakMap = new WeakMap();
const obj1 = {};
const obj2 = {};

weakMap.set(obj1, 'value1');
weakMap.set(obj2, 'value2');

const arr = [obj1, obj2];
const result = arr.map(obj => weakMap.get(obj)).join(', ');

console.log(result);

Ответ: "value1, value2"

JavaScript test | #JavaScript