配列からnilを削除する方法
test.rb
a = [1, 2, nil, 4, nil]
p a.compact #=> [1, 2, 4]
p a #=> [1, 2, nil, 4, nil]
test.rb
a = [1, 2, nil, 4, nil]
p a.compact! #=>[1, 2, 4]
p a #=> [1, 2, 4]
nilが入ってない配列にcompact!を使うとnilが返ってくるので注意してね
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