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JavaScript WeakMap set() Method

JavaScript WeakMap set() Method with example, clear() method, javascript weakmap methods, javascript weakmap set() method, javascript weakmap delete() method, javascript weakmap has() method, javascript weakmap get() method etc.

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JavaScript WeakMap set() method

The JavaScript WeakMap set() method is used to add or update an element to WeakMap object with the particular key-value pair. Each value must have a unique key (i.e. object).

Syntax

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

weakMapObj.set(key,value)

Parameter

key - It represents the key to be added.

value - It represents the value to be added.

Return

The WeakMap object.

JavaScript WeakMap set() method example

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

Example 1

Let's see an example to add elements to WeakMap object.

<script>
var wm = new WeakWeakMap();
var obj1 = {};
var obj2 = {};
var obj3= {};
wm.set(obj1, "jQuery");
wm.set(obj2, "AngularJS");
wm.set(obj3,"Bootstrap");
document.writeln(wm.get(obj1)+"<br>");
document.writeln(wm.get(obj2)+"<br>");
document.writeln(wm.get(obj3));
</script>
Test it Now

Output:

jQuery
AngularJS
Bootstrap

Example 2

Let's see an example to add elements to WeakMap object in chainable form.

<script>
var wm = new WeakMap();
var obj1 = {};
var obj2 = {};
var obj3= {};
wm.set(obj1, "jQuery").set(obj2, "AngularJS").set(obj3,"Bootstrap");
document.writeln(wm.get(obj1)+"<br>");
document.writeln(wm.get(obj2)+"<br>");
document.writeln(wm.get(obj3));
</script>
Test it Now

Output:

jQuery
AngularJS
Bootstrap

Example 3

In this example, we will determine the result when different values are added to the same object.

<script>
var wm = new WeakMap();
var obj1 = {};
var obj2 = {};
wm.set(obj1, "jQuery");
wm.set(obj2, "AngularJS");
wm.set(obj2,"Bootstrap");
document.writeln(wm.get(obj1)+"<br>");
document.writeln(wm.get(obj2)+"<br>");
document.writeln(wm.get(obj2));
</script>
Test it Now

Output:

jQuery
Bootstrap
Bootstrap

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