Optional parameters: Difference between revisions
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(Added Oz example.) |
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OCaml does not support optional positional parameters, because, since OCaml supports currying, it would conflict with partial applications, where you do not provide all the arguments to a function, and it results in a function which expects the remaining arguments. |
OCaml does not support optional positional parameters, because, since OCaml supports currying, it would conflict with partial applications, where you do not provide all the arguments to a function, and it results in a function which expects the remaining arguments. |
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=={{header|Oz}}== |
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Oz supports optional parameters only for methods, not for functions. |
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<lang oz>declare |
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class Table |
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attr |
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rows |
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meth init(Rows) |
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rows := Rows |
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end |
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meth sort(ordering:O<=Lexicographic column:C<=1 reverse:R<=false) |
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fun {Predicate Row1 Row2} |
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Res = {O {Nth Row1 C} {Nth Row2 C}} |
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in |
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if R then {Not Res} else Res end |
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end |
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in |
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rows := {Sort @rows Predicate} |
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end |
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end |
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fun {Lexicographic As Bs} %% omitted for brevity |
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end |
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T = {New Table init([["a" "b" "c"] ["" "q" "z"] ["zap" "zip" "Zot"]])} |
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in |
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{T sort} |
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{T sort(column:3)} |
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{T sort(column:2)} |
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{T sort(column:2 reverse:true)} |
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{T sort(ordering:fun {$ A B} {Length B} < {Length A} end)}</lang> |
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=={{header|Perl}}== |
=={{header|Perl}}== |
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