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array of random letters ruby

(0...50).map { ('a'..'z').to_a[rand(26)] }.join
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ruby generate array of alphabet

('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"]
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