The get method of the WeakMap in JavaScript retrieves the value associated with a particular key from a WeakMap instance.
Syntax
The syntax for the get method can be illustrated as follows:
Example
WeakMapObj.get(key)
Parameter
key - The key to be searched.
Return
The value of the specified key.
JavaScript WeakMap get method example
In this section, we will explore the get method by examining a range of examples.
Example 1
Let's see a simple example of get method.
Example
<script>
var wm = new WeakMap();
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>
Output:
Output
jQuery
AngularJS
Bootstrap
Example 2
Let’s examine a scenario to establish the outcome when a WeakMap object does not include the specified key.
Example
<script>
var wm = new WeakMap();
var obj1 = {};
var obj2 = {};
var obj3= {};
wm.set(obj1, "jQuery");
wm.set(obj2, "AngularJS");
wm.set(obj3,"Bootstrap");
document.writeln(wm.get());//returns undefined
</script>
Output:
Output
undefined
