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zero_init.rb

This Ruby code snippet demonstrates the use of Hash.new(0) to create a hash with a default value of 0. When accessing a key that doesn’t exist (like ‘key’ initially), it returns 0, allowing you to increment it directly without needing to check if the key exists first. This provides a concise way to count occurrences or accumulate values associated with hash keys.

Ruby code snippet

hash = Hash.new(0)
#=> {}
hash['key'] += 1
#=> 1

Executed with Ruby 3.4.5.