The add method of the JavaScript Set is utilized to append a new object to the conclusion of a WeakSet object.
Syntax
The syntax for the add method is illustrated as follows:
Example
weakSetObj.add(value)
Parameter
value - It represents the object to be added.
Return
The WeakSet object.
JavaScript Set add method example
In this section, we will explore the add method by examining a series of examples.
Example 1
Let’s explore an example demonstrating how to incorporate an object into a WeakSet instance.
Example
<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>
Output:
Output
true
true
Example 2
In this illustration, we will examine if we can incorporate objects into a WeakSet object without prior initialization.
Example
<script>
var ws = new WeakSet();
try
{
ws.add(obj);
document.writeln(ws.has(obj));
}
catch(error)
{
document.writeln(error);
}
</script>
Output:
Output
ReferenceError: obj is not defined
