Javascript WeakSet add()

Introduction

The Javascript WeakSet add() method appends object to a WeakSet object.

It returns the WeakSet object. 

ws.add(value);
ParametersOptional Meaning
value Required. The object to add to the WeakSet.

Weakset only takes objects as arguments. 

var ws = new WeakSet();
console.log(ws);//from  ww  w  . j  a v  a 2  s  . co  m
ws.add(window);
console.log(ws);
ws.has(window);
console.log(ws);
//ws.add(1); error



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