JavaScript Map clear() method

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

Syntax

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

JavaScript Map clear() method example

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

Example 1

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

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

Test it Now

Output:

Size before invoking clear(): 3
Size after invoking clear(): 0

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 clear(): "+ map.has(2)+"<br>");
map.clear();
document.writeln("Element present after invoking clear(): "+map.has(2));
</script>

Test it Now

Output:

Element present before invoking clear(): true
Element present after invoking clear(): false

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JavaScript Map clear() method

Syntax