Javascript WeakSet has()

Introduction

The Javascript WeakSet has() method checks whether an object exists in a WeakSet or not.

It returns a boolean value. 

ws.has(value);
Parameters Optional Meaning
value not The object to test.

Using the has method 

var ws = new WeakSet();
var obj = {};//from   w  w  w  .jav a  2  s  . c  o  m
ws.add(window);

let a = mySet.has(window);  // returns true
console.log(a);
a = mySet.has(obj);     // returns false
console.log(a);



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