How to change all the keys of a hash by a new set of given keys

Question

How do I change all the keys of a hash by a new set of given keys?

Is there a way to do that elegantly?

Answer 1

If you also worry about performance, this is faster:

hsh.keys.each { |k| hsh[ key_map[k] ] = hsh.delete(k) if key_map[k] }

You don't create a new Hash and you rename only the necessary keys. That gives you better performance.

You can find more details in "How to elegantly rename all keys in a hash in Ruby?"