Optional parameters: Difference between revisions
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=={{header|OCaml}}== |
=={{header|OCaml}}== |
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OCaml has optional named parameters. It is conventional to place a non-optional parameter after the optional parameters, because if the optional parameters were at the end, then if you don't provide them, it will just look like a partial application (because OCaml supports currying), resulting in a function which still expects the optional parameters. |
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OCaml has optional named parameters. |
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<lang ocaml>let sort_table ?(ordering = compare) ?(column = 0) ?(reverse = false) table = |
<lang ocaml>let sort_table ?(ordering = compare) ?(column = 0) ?(reverse = false) table = |
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- : string list list = |
- : string list list = |
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[["zap"; "zip"; "Zot"]; ["a"; "b"; "c"]; [""; "q"; "z"]]</lang> |
[["zap"; "zip"; "Zot"]; ["a"; "b"; "c"]; [""; "q"; "z"]]</lang> |
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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. |
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=={{header|Python}}== |
=={{header|Python}}== |
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