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each_consの使い方

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each_consとは

## 使い方

each_cons(n) -> Enumerator
each_cons(n) {|list| ... } -> nil

要素を重複ありで n 要素ずつに区切り、ブロックに渡して繰り返します。
ブロックを省略した場合は重複ありで n 要素ずつ繰り返す Enumerator を返します。

(1..10).each_cons(3){|v| p v }
# => [1, 2, 3]
#    [2, 3, 4]
#    [3, 4, 5]
#    [4, 5, 6]
#    [5, 6, 7]
#    [6, 7, 8]
#    [7, 8, 9]
#    [8, 9, 10]
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