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Marahin/freezer.rb

Created October 24, 2018 11:25
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Frozen things are frozen
Raw
freezer.rb
["john", "alice", "philip"]
=> ["john", "alice", "philip"]
arr.map!(&:freeze).freeze
=> ["john", "alice", "philip"]
arr.map(&:downcase!)
FrozenError: can't modify frozen String
from (pry):3:in `downcase!'
arr.map!(&:downcase)
FrozenError: can't modify frozen Array
from (pry):4:in `map!'
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