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Question 208 of 521

Part 4: Prototypes, Object Methods & Event Loop (174 - 253)

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JavaScript Internals (521 Qs)•Part 4: Prototypes, Object Methods & Event Loop (174 - 253)

What is a WeakSet

A WeakSet is used to store a collection of weakly(weak references) held objects. The syntax would be as follows,

javascript
  new WeakSet([iterable]);

Let's see the below example to explain it's behavior,

javascript
  var ws = new WeakSet();
  var user = {};
  ws.add(user);
  ws.has(user); // true
  ws.delete(user); // removes user from the set
  ws.has(user); // false, user has been removed
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