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Optional parameters: Difference between revisions
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Fixed lang tags.
Underscore (talk | contribs) (→{{header|Perl}}: Rewrote 212.249.2.158's addition to be a bit more precise and a bit less anti-Perl.) |
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GuiClose:
ExitApp</lang>
=={{header|BASIC}}==
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=={{header|Logo}}==
{{works with|UCB Logo}}
<lang logo>to sort :table [:column 1] [:ordering "before?] [:reverse "false]▼
▲to sort :table [:column 1] [:ordering "before?] [:reverse "false]
; ...
end</lang>
The function "sort" has a default arity of 1 for the required parameter. When overriding default parameters, you must wrap the call in parentheses to specify the different arity.
<lang logo>sort :table
(sort :table 2)
(sort :table 3 "less? "true)</lang>
=={{header|OCaml}}==
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"a" "b" "c"
"" "q" "z"
>>>
See the Python entry in [[Named_Arguments#Python|Named Arguments]] for a more comprehensive description of Python function parameters and call arguments.
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=={{header|R}}==
Optional parameters are given using a name=value syntax within the function header.
<lang R>tablesort <- function(x, ordering="lexicographic", column=1, reverse=false)▼
▲tablesort <- function(x, ordering="lexicographic", column=1, reverse=false)
{
# Implementation
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# Usage is e.g.
tablesort(mytable, column=3)</lang>
=={{header|Ruby}}==
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=={{header|Slate}}==
In Slate, named optional parameters may be specified in the method signature, but not defaults, so there is a macro <tt>defaultsTo:</tt> for specifying that within the method body at run-time.
<lang slate>s@(Sequence traits) tableSort &column: column &sortBy: sortBlock &reverse: reverse▼
▲s@(Sequence traits) tableSort &column: column &sortBy: sortBlock &reverse: reverse
[
column `defaultsTo: 0.
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reverse ifTrue: [sortBlock: [| :a :b | (sortBlock applyTo: {a. b}) not]].
s sortBy: [| :a :b | sortBlock applyTo: {a at: column. b at: column}]
].</lang>
=={{header|Tcl}}==
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=={{header|XSLT}}==
You can give any template parameter a default value using the optional "select" attribute.
<lang xml><xsl:template name="sort">
<xsl:
▲ ...
▲ </xsl:template>
{{omit from|TI-83 BASIC}} {{omit from|TI-89 BASIC}}
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