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wildjcrt/exclamation_mark.rb

Created October 6, 2014 02:22
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Raw
exclamation_mark.rb
>> a = [1, 2, 3, 4, 5, 1, 2]
=> [1, 2, 3, 4, 5, 1, 2]
>> a.compact.size
=> 5
>> a.compact!.size
NoMethodError: undefined method `size' for nil:NilClass
from (irb):14
from /Users/wildjcrt/.rvm/rubies/ruby-2.1.3/bin/irb:11:in `<main>'
Raw
hash.rb
>> hash=Hash.new []
=> {}
>> hash[:foo] << 1
=> [1]
>> hash[:foo] << 2
=> [1, 2]
>> hash[:foo] << 3
=> [1, 2, 3]
>> hash.each {|key, value| puts key; puts value;}
=> {}
>> hash
=> {}
>> hash.keys
=> []
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