How to check if hash has keys?

If you're working with a hash in a programming context, it's important to know whether or not it contains any keys. This can be especially useful when dealing with dictionaries or other data structures that are hashed in some way. But how can you check if a hash has keys? One way to do this is to use the built-in methods or functions that are available in the programming language you're working with. For example, in Python, you can use the `keys()` method on a dictionary, which returns a view object that displays the dictionary's keys. If the dictionary is empty, the `keys()` method will return an empty view. However, it's important to note that a hash, in the strict sense of the term, is a fixed-length string of characters that represents a larger piece of data. A hash is not a data structure like a dictionary, and as such, it doesn't have keys in the same way that a dictionary does. If you're working with a hash and you want to check if it "has keys," you might actually be referring to the underlying data structure that the hash represents, or you might be using the term "hash" interchangeably with a data structure like a dictionary. So, the answer to the question "How to check if hash has keys?" depends on the context and the programming language you're using. In general, if you're working with a data structure that can have keys, like a dictionary, you can use the built-in methods or functions provided by your programming language to check if it has any keys. If you're working with a hash in the strict sense of the term, however, you'll need to clarify what you mean by "has keys," as a hash itself does not contain keys.