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twe4ked/auto_incrementing_hash_value.rb

Last active October 11, 2016 23:03
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auto_incrementing_hash_value.rb
h = Hash.new { |hash, key| hash[key] = hash.fetch(key) { hash.values.max.to_i + 1 } }
# > h['foo']
# 1
# > h['foo']
# 1
# > h['bar']
# 2
require 'securerandom'
h = Hash.new { |hash, key| hash[key] = hash.fetch(key) { SecureRandom.uuid } }
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