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willmurphyscode/hash_on_mutated_array.rb

Created March 26, 2017 22:08
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Demonstration that mutating an array in Ruby changes it's hash value
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hash_on_mutated_array.rb
def does_it_change
mutable_array = [1,2]
hash = {}
hash[mutable_array] = 'foo'
puts hash[mutable_array].inspect # prints "foo"
mutable_array[1] = 3
puts hash[mutable_array].inspect # prints "nil"
end
does_it_change
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