How to check if Map contains a Specific Key in JavaScript?

JavaScript – Check if Map contains a Specific Key

To check if Map contains a specific key in JavaScript, call has() method on this map and pass the specific key as argument to it.

has() method returns a boolean value. The return value is true if the key is present in the map, else, false.

Syntax

The syntax to check if specific key key is present in a Map map using has() method is

map.has(key)

Examples

In the following example, we take a Map with keys 'a', 'b', and 'c'. We shall check if the key 'b' is present in this Map using has() method.

index.html

Now, let us check if a key ‘x’ is present in this map.

index.html

Conclusion

In this JavaScript Tutorial, we learned how to check if a specific key is present in a Map in JavaScript using has() method, with examples.