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higaki/frozen.rb

Last active November 20, 2019 03:52
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frozen.rb
# frozen_string_literal: true
RUBY_VERSION # => "2.7.0"
s = "Ruby"
t = "Ruby"
s == t # => true
s.equal? t # => true
s.object_id # => 12886797280
t.object_id # => 12886797280
s.upcase! rescue $! # => #<FrozenError: can't modify frozen String: "Ruby">
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