Comprehensive Ruby Programming

Iterating over a hash for a key or value

You already learned how to iterate through a hash in one of our previous sections, however, it's a very critical task that you'll be using quite often. With that in mind, I'm going to discuss how it works in more detail. Also, I'm going to show you how you can iterate over only the keys or values.

I'm going to start with the hash we created in the previous section:

people = { jordan: 32, tiffany: 27, kristine: 10, heather: 29 } 

When you want to only grab the keys, your code can be like this:

people.each_key do |key|   puts key end 

If I run this code, it prints out each one of the keys like this: