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Marahin/fridge_contents_frozen_or_not.rb

Created October 24, 2018 11:10
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Are fridge contents frozen or not?
Raw
fridge_contents_frozen_or_not.rb
arr = ["john", "alice", "philip"]
=> ["john", "alice", "philip"]
arr.map!(&:upcase) # works, array not frozen
=> ["JOHN", "ALICE", "PHILIP"]
arr
=> ["JOHN", "ALICE", "PHILIP"]
arr.freeze
=> ["JOHN", "ALICE", "PHILIP"]
arr.map!(&:downcase) # doesnt work, array is frozen
FrozenError: can't modify frozen Array
from (pry):5:in `map!'
arr.map(&:downcase!) # works, array is frozen, but particular objects inside are not
=> ["john", "alice", "philip"]
arr
=> ["john", "alice", "philip"]
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