JavaScript Map delete() Method Tutorial

In this section, we will learn what the delete() method is and how to use it in JavaScript.

What is JavaScript Map delete() Method?

We use the `delete()` method to delete a specific key from a map object.

Note: when a key is removed from a map, its value will be removed automatically as well.

JavaScript Map delete() Method Syntax:

delete(key);

delete() Function Parameters:

This method takes one argument and that is the key in which we want to remove.

delete() Function Return Value:

If the method removed the target key, it will return the value `true` which means the operation ran successfully. Otherwise it will return the value `false`.

One of the reasons that this method might return the value false is because the target key might not exist in the target map.

Example: using Map delete() method in JavaScript

const map = new Map();
map.set("John","222-22222222");
map.set(22 , 2000);
map.set(true, false); 
map.set("Jack", "333-3234232");

if (map.delete('John')){
  console.log(`The key 'John' successfully removed from the map.`);
}

Output:

The key 'John' successfully removed from the map.

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