Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
How to remove all the elements from a map in JavaScript?
The map is basically a collection of elements where each element is stored as a Key, value pair. It can hold both objects and primitive values as either a key or a value. When we iterate over the map object it returns the key,value pair in the same order as inserted. The map has provided a method called map.clear() to remove the values inside a map. This method will remove every key/value pair and make the map totally empty.
syntax
map.clear(obj);
map.obj() takes an object as a parameter and removes each and every value so as to make it empty.
Example-1
In the following example, a map is created and 2 elements were passed to it. Before applying map.clear() method the size of the map object was two but after applying the size was zero.
<html>
<body>
<script>
var myMap = new Map();
myMap.set(0, 'Tutorialspoint');
myMap.set(1, 'Tutorix');
document.write(myMap.size);
document.write("</br>");
myMap.clear();
document.write(myMap.size);
</script>
</body>
</html>Output
2 0
Example-2
In the following example, a map is created and 4 elements were passed to it. Before applying map.clear() method the size of the map object was four but after applying the size was zero.
<html>
<body>
<script>
var myMap = new Map();
myMap.set(0, 'India');
myMap.set(2, 'Australia');
myMap.set(3, 'England');
myMap.set(4, 'Newzealand');
document.write(myMap.size);
document.write("</br>");
myMap.clear();
document.write(myMap.size);
</script>
</body>
</html>Output
4 0
1K+ Views
