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git-svn-id: svn://svn.code.sf.net/p/magicseteditor/code/trunk@985 0fc631ac-6414-0410-93d0-97cfa31319b6
35 lines
1.6 KiB
Plaintext
35 lines
1.6 KiB
Plaintext
Default arguments
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It is possible to declare default arguments for functions using the @@@@ operator.
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> function := { "argument was: " + arg }@(arg:"default")
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If this function is called without the @arg@ argument, then the default value @"default"@ is used instead.
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For example:
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> function() == "argument was: default"
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> function(arg: "something else") == "argument was: something else"
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For determining whether the argument is set only explicit arguments count, not everything in scope, so
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> arg := "something else"
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> function() == "argument was: default"
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//Defaults are evaluated at the time the @@@@ operator is evaluated, so they can be used to simulate static scoping.
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--Rule functions--
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Some functions are available in ''rule form''.
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These rule form functions are functions that create a new [[type:function]] with some defaults filled in.
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That new function, the rule, applies some transformation to the input and returns the result.
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A rule is like a normal function with all parameters given, except for the @input@.
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Rules are often combined using the + operator, for example:
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> # First all "a"s are replaced, then all "b"s.
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> remove_as_and_bs := replace_rule(match: "a", replace: "") +
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> replace_rule(match: "b", replace: "")
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>
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> text_with_as_and_bs := "bla bla bla"
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> text_without_as_and_bs := remove_as_and_bs(text_with_as_and_bs)
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<div style="text-align:right;">previous: <a href="functions">← Functions</a> | next: <a href="control_structures">Control structures →</a></div>
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