JavaScript WeakSet add() Method

JavaScript WeakSet add() Method with example, WeakSet objects are collections of objects. An object in the WeakSet occurs once in the WeakSet collection, javascript weakset add() method, javascript weakset delete() method, javascript weakset has() method etc.

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JavaScript Set add() method

The JavaScript Set add() method is used to add a new object to the end of a WeakSet object.

Syntax

The add() method is represented by the following syntax:

weakSetObj.add(value)

Parameter

value - It represents the object to be added.

Return

The WeakSet object.

JavaScript Set add() method example

Here, we will understand add() method through various examples.

Example 1

Let's see an example to add object to WeakSet object.

<script>
var ws = new WeakSet();
var obj1={};
var obj2={};
ws.add(obj1);
ws.add(obj2);
//Let's check whether the WeakSet object contains the added object
document.writeln(ws.has(obj1)+"<br>");
document.writeln(ws.has(obj2));
</script>

Test it Now

Output:

true
true

Example 2

In this example, we will see whether we add the objects to WeakSet object without initializing them.

<script>
var ws = new WeakSet();
try
  {
ws.add(obj);
document.writeln(ws.has(obj));    
  }
catch(error)
  {
    document.writeln(error);
  }
</script>

Test it Now

Output:

ReferenceError: obj is not defined

Next TopicWeakSet delete() Method

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