How to limit the size of one hash entry in Ruby?

Question

ruby

Suppose I need one entry (key => value) to have a fixed size of 200 bytes.
When creating a record with a size larger, I display an error in the console.
How can I do this using the language?

Answer 1

#!/usr/bin/env ruby

str = 'йцукен'
puts 'Error' if str.bytesize > 10