メソッド定義
method.rb
def メソッド名
処理
end
each メソッド
each.rb
オブジェクト.each do | 変数 |
puts 変数[] + []
end
while true （trueの間処理を繰り返す）
while.rb
while true
値 = A
if 値 == A
処理１
elsif 値 == B
処理２
else 値 == C
処理３
#trueではないので処理が終わる
end
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