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概要

paiza.ioでelixirやってみた。
練習問題やってみた。

練習問題

List.update_atをEnumで実装せよ。

サンプルコード



[1, 2, 3]
|> List.update_at(1, &(&1 + 2))
|> IO.inspect

[1, 2, 3]
|> Enum.with_index
|> Enum.map(fn {val, ind} ->
    cond do
    ind == 1 ->
        val + 2
    true ->
        val
    end
end)
|> IO.inspect
        
            

実行結果

[1, 4, 3]
[1, 4, 3]

成果物

以上。

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