Method 1: Using the clear method
The Map object in JavaScript provides a built-in clear method that removes all key-value pairs from the map. Here’s how you can use this method:
// Create a new Map object
let myMap = new Map();
// Add some key-value pairs
myMap.set('key1', 'value1');
myMap.set('key2', 'value2');
myMap.set('key3', 'value3');
// Clear the Map object
myMap.clear();
console.log(myMap.size); // Output: 0
In the above code, we first create a new Map object myMap and add some key-value pairs. We then call the clear method on the map, which removes all the key-value pairs. Finally, we print the size of the map, which should be 0 indicating that all the key-value pairs have been cleared.
Method 2: Reassigning a new Map object
Another approach to clear a Map object is by reassigning it with a new Map object. Here’s an example:
// Create a new Map object
let myMap = new Map();
// Add some key-value pairs
myMap.set('key1', 'value1');
myMap.set('key2', 'value2');
myMap.set('key3', 'value3');
// Clear the Map object by reassigning with a new Map object
myMap = new Map();
console.log(myMap.size); // Output: 0
In the above code, we follow similar steps as before, but instead of calling the clear method, we assign a new Map object to the variable myMap. This effectively clears the original Map object and creates a fresh one with no key-value pairs.
Conclusion:
In JavaScript, there are multiple ways to clear the key-value pairs from a Map object. You can use the clear method provided by the Map object or reassign the Map object with a new instance. Both methods achieve the same result of clearing the Map. Choose the method that best fits your code logic and requirements.