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zero_init.rb

This Ruby code snippet demonstrates how to increment the value of a key in a hash by using the += operator. The Hash.new(0) method creates a new hash with all values initialized to zero, so when we try to access a key that doesn’t exist, it will return 0.

hash = Hash.new(0)
hash['key'] += 1

The first line creates a new hash called hash and initializes all its values to 0. The second line tries to access the value associated with the key 'key', but since that key doesn’t exist, it returns 0. Then we use the += operator to add 1 to that value, so now the new value for the key 'key' is 1. Note: It’s important to remember that in Ruby, hashes are not ordered, so when you access a value by its key, the order of the keys and values may change.

Ruby code snippet

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

Executed with Ruby 3.4.4.