WeakSet:
*Checking if a value exists
Checking if a value exists
suggest changeTo check if a value exits in a WeakSet, use the .has() method.
const obj1 = {},
obj2 = {};
const weakset = new WeakSet([obj1]);
console.log(weakset.has(obj1)); // true
console.log(weakset.has(obj2)); // false
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