JavaScript Map delete() method

The JavaScript map delete() method is used to remove all the elements from Map object.

Syntax

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

JavaScript Map delete() method example

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

Example 1

Let's see a simple example of delete() method.

<script>
var map=new Map();
map.set(1,"jQuery");
map.set(2,"AngularJS");
map.set(3,"Bootstrap");
document.writeln("Size before invoking delete() method: "+ map.size+"<br>");
map.delete(2);
document.writeln("Size after invoking delete() method: "+map.size);
</script>

Test it Now

Output:

Size before invoking delete() method: 3
Size after invoking delete() method: 2

Example 2

Let's see an example to determine whether the map object contains the specified element.

<script>
var map=new Map();
map.set(1,"jQuery");
map.set(2,"AngularJS");
map.set(3,"Bootstrap");
document.writeln("Element present before invoking delete() method: "+ map.has(2)+"<br>");
map.delete(2);
document.writeln("Element present after invoking delete() method: "+map.has(2));
</script>

Test it Now

Output:

Element present before invoking delete() method: true
Element present after invoking delete() method: false

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JavaScript Map delete() method

Syntax