JavaScript Map.clear() method is used for the removal of all the elements from a map and making it empty. It removes all the [key, value] from the map. No arguments are required to be sent as parameters to the Map.clear() method and it returns an undefined return value.
Syntax:
mapObj.clear()
Parameters: No parameters are required in the Map.clear() method.
Return Value: Map.clear() method has an undefined return type.
Examples of the above method are provided below.
Example 1: In this example, a map object “myMap” has been created with a single [key, value] pair and the Map.clear() method is used to remove the [key, value] pair from “myMap”. myMap.size() is used to check the number of [key, value] pairs belonging to the map object.
javascript
// creating a map objectlet myMap = new Map();// Adding [key, value] pair to the mapmyMap.set(0, 'neveropen');// displaying the number of// [key, value] pairs the map hasconsole.log(myMap.size);// removing the [key, value] pairs of// the map using Map.clear() methodmyMap.clear();// displaying the number of// [key, value] pairs the map hasconsole.log(myMap.size); |
Output:
1 0
Example 2: In this example, a map object “myMap” has been created with a three [key, value] pairs and the Map.clear() method is used to remove all the [key, value] pairs from “myMap”. myMap.size() is used to check the number of [key, value] pairs belonging to the map object.
javascript
// creating a map objectlet myMap = new Map();// Adding [key, value] pair to the mapmyMap.set(0, 'neveropen');myMap.set(1, 'is an online portal');myMap.set(2, 'for neveropen');// displaying the number of// [key, value] pairs the map hasconsole.log(myMap.size);// removing the [key, value] pairs// of the map using Map.clear() methodmyMap.clear();// displaying the number of// [key, value] pairs the map hasconsole.log(myMap.size); |
OUTPUT :
3 0
Applications:
- Map.clear() Method is used to remove all the [key, value] pairs of a map.
Exceptions :
- If the variable is not of the Map type then the Map.entries() operation throws a TypeError.
We have a complete list of Javascript Map methods, to check them please go through the Javascript Map Complete Reference article.
Supported Browsers:
- Chrome 38 and above
- Edge 12 and above
- Firefox 19 and above
- Internet Explorer 11 and above
- Opera 25 and above
- Safari 8 and above
