44 lines
1.4 KiB
Text
44 lines
1.4 KiB
Text
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title::matchItem
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categories::Common methods
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summary::test if object fulfils a constraint
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Implemented by: link::Classes/Object::, link::Classes/Collection::, link::Classes/Nil::, link::Classes/Function::
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method:: matchItem(item)
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matchItem(item) may be passed to different objects that behave as constraints. More Objects may be conceived to implement matchItem to extend the interface.
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See also: link::Classes/Dictionary#-matchAt::.
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section:: Object-matchItem
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Test if strong::item:: is identical to strong::object::.
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code::
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a = [1, 2, 3, "wort", "1", [pi, 2pi]];
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a.any { |x| x.matchItem(3) }; // true
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a.any { |x| x.matchItem(5) }; // false
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a.any { |x| x.matchItem("wort") }; // false, because "wort" == "wort" but not identical.
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::
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section::Collection-matchItem
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Test if strong::item:: is included in strong::collection::.
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code::
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a = [1, 2, 3, "wort", "1", [pi, 2pi]];
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a.any { |x| x.matchItem(pi) }; // true
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::
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section::Nil-matchItem
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returns true (link::Classes/Nil:: serves as a "joker", a stand-in for anything).
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code::
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a = [nil, 1, 2, 3, "wort", "1", [pi, 2pi]];
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a.any { |x| x.matchItem(10000.rand) }; // true always
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::
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section::Function-matchItem
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Test strong::item:: by passing it to a function which should return a link::Classes/Boolean::.
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code::
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a = [10, 20, 30, { |item| item.isPrime }];
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a.any { |x| x.matchItem(3) }; // true
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a.any { |x| x.matchItem(4) }; // false
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a.any { |x| x.matchItem(10) }; // true
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::
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