32 lines
1.2 KiB
Elixir
32 lines
1.2 KiB
Elixir
defmodule Optional_parameters do
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def sort( table, options\\[] ) do
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options = options ++ [ ordering: :lexicographic, column: 0, reverse: false ]
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ordering = options[ :ordering ]
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column = options[ :column ]
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reverse = options[ :reverse ]
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sorted = sort( table, ordering, column )
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if reverse, do: Enum.reverse( sorted ), else: sorted
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end
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defp sort( table, :lexicographic, column ) do
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Enum.sort_by( table, &elem( &1, column ) )
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end
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defp sort( table, :numeric, column ) do
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Enum.sort_by( table, &elem( &1, column ) |> String.to_integer )
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end
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def task do
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table = [ { "123", "456", "0789" },
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{ "456", "0789", "123" },
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{ "0789", "123", "456" } ]
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IO.write "sort defaults "; IO.inspect sort( table )
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IO.write " & reverse "; IO.inspect sort( table, reverse: true )
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IO.write "sort column 2 "; IO.inspect sort( table, column: 2)
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IO.write " & reverse "; IO.inspect sort( table, column: 2, reverse: true)
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IO.write "sort numeric "; IO.inspect sort( table, ordering: :numeric)
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IO.write " & reverse "; IO.inspect sort( table, ordering: :numeric, reverse: true)
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end
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end
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Optional_parameters.task
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