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はじめに

移植やってます

for (Python)

h = { 1: 2, 3: 4, 5: 6 }
for x in h:
    print(x)

# 1
# 3
# 5

知っている人にとって当たり前かもしれませんが、dictforで変数が1つの場合、キーのみを返します。

知らなかったため、人生初のstack level too deepを頂きました。
とんでもないクリスマスイブになるところでしたが、デバッグの甲斐あって普通のクリスマスになりそうです。

each_key (Ruby)

h = { 1 => 2, 3 => 4, 5 => 6 }
h.each_key do |key|
  puts key
end
h.keys.map{ puts _1 }

mapselectのときは、keysを使用することも可能です。

メモ

  • Python の for を学習した
  • 道のりは遠そう
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