JavaScript .clear()

The Map.clear() method in JavaScript removes all entries (key-value pairs) from a Map object. After invoking it, the map becomes empty and its .size property becomes 0.

Syntax

map.clear()

Parameters:

• It does not take any parameters.

Return value:

• The method returns undefined after clearing the map.

Example

In this example, a map is created with two entries, then cleared, and the size and values are checked:

const myMap = new Map();
myMap.set('a', 1);
myMap.set('b', 2);
console.log(myMap.size);

myMap.clear();

console.log(myMap.size);
console.log(myMap.get('a'));

Copy to clipboard
Copy to clipboard

The output of this code will be:

2
0
undefined

Copy to clipboard
Copy to clipboard

Codebyte Example

In this example, a fruit inventory map is initialized with values, then cleared to show that the map becomes empty:

Visit us
Visit us
Hide code
Code
Output
Hide output
Loading...
Copy to your clipboard
Copy Codebyte
Run