[#50231] [ANN] OedoRubyKaigi05 — SASADA Koichi <ko1@...>
下記の要領で大江戸Ruby会議05を行なうのでご連絡します。
5 messages
2015/10/08
[ruby-list:50249] Re: Hash.new([])の挙動について
From:
take_tk <ggb03124@...>
Date:
2015-10-29 01:30:33 UTC
List:
ruby-list #50249
たけ(tk)です
破壊的メソッドを使わなければよいのでは？
irb(main):020:0> a = Hash.new([]) => {}
irb(main):021:0> a["key"] += [1] => [1]
irb(main):022:0> a["key"] += [2] => [1, 2]
irb(main):023:0> a["key"] += [3] => [1, 2, 3]
irb(main):024:0> a => {"key"=>[1, 2, 3]}
irb(main):025:0> a.default => []
irb(main):026:0>