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数値、アルファベットからランダムなn文字の文字列を生成する

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0〜9、a〜z、A〜Zの中から5文字ランダムに抽出し、文字列に変換する

((0..9).to_a + ("a".."z").to_a + ("A".."Z").to_a).sample(5).join
 # => "Aw5EV" 

その他、文字列配列生成サンプル

(0..9).to_a
 # => [0, 1, 2, 3, 4, 5, 6, 7, 8, 9] 

("a".."z").to_a
 # => ["a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z"] 

("A".."Z").to_a
 # => ["A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z"] 

("A".."z").to_a
 # => ["A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z", "[", "\\", "]", "^", "_", "`", "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z"] 

(("a".."z").to_a + ("A".."Z").to_a)
 # => ["a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z", "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z"] 
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