How can I filter a hash in Ruby?

How can I filter a hash in Ruby?

You can use the select method to filter a hash based on a condition. For example, my_hash.select { |key, value| value > 10 } will return a new hash with only the key-value pairs where the value is greater than 10.

Can you show me an example with a specific hash?

Sure! Let's say you have a hash: my_hash = {a: 5, b: 15, c: 10}. You can filter it like this: filtered_hash = my_hash.select { |key, value| value > 10 }, which will give you {b: 15}.

What if I want to filter by key instead of value?

You can do that too! For example, if you want to filter keys that start with 'a', you can use: my_hash.select { |key, value| key.to_s.start_with?('a') }.

Is there a way to modify the values while filtering?

Yes! You can use transform_values along with select. For example: my_hash.select { |key, value| value > 10 }.transform_values { |value| value * 2 } will double the values of the filtered hash.