WeakMap and WeakSet

Question 1

The first difference between Map and WeakMap is that keys must be ________

Answer 1

objects, not primitive values:

Question 2

let weakMap = new WeakMap();
let obj = {};
weakMap.set(obj, “ok”); // returns?

Answer 2

works fine (object key)

Question 3

let weakMap = new WeakMap();

let obj = {};

weakMap.set(“test”, “Whoops”); //

Answer 3

Error, because “test” is not an object

Question 4

WeakMap has only the following methods (4);

Answer 4

weakMap.set(key, value)
weakMap.get(key)
weakMap.delete(key)
weakMap.has(key)

Question 5

WeakMap does not support iteration and methods (3)

Answer 5

keys(), values(), entries()

Question 6

______ is Set-like collection that stores only objects and removes them once they become inaccessible by other mean

Answer 6

WeakSet