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jimjh/deep_freeze.rb

Last active December 12, 2015 09:19
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deep_freeze ruby enumerables.
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deep_freeze.rb
# ~*~ encoding: utf-8 ~*~
module Enumerable
# Freezes elements and nested containers recursively.
def deep_freeze
each { |o| o.respond_to?(:deep_freeze) ? o.deep_freeze : o.freeze }
freeze
end
end
# == Usage
# x = {a: {b: 'c'}}.deep_freeze
# x[:a][:b].upcase! # >> RuntimeError: can't modify frozen String
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