[英]Pass block to delegated << Array method in Ruby
I have created a delegated Array class like this: 我创建了一个委托的Array类,如下所示:
class LeadPartArray < DelegateClass(Array)
def <<(part, &block)
super(part) unless @arr.select{|p| p.text == part.text}.size > 0
end
def initialize(arr = [])
@arr = arr
super(@arr)
end
end
I am overriding the << method and I want to be able to pass a block in that I can use as a predicate. 我重写<<方法,我希望能够传递一个块,因为我可以用作谓词。
I have the following test that is not even legal Ruby syntax: 我有以下测试甚至不合法的Ruby语法:
def test_should_pass_predicates_to_add
arr = LeadPartArray.new([])
part = LeadCapturer::LeadPart.new("text", LeadCapturer::TextTag.new, 2)
predicate = Proc.new{|part| part.text.size < 4}
arr <<(part, &predicate)
assert_equal(0, arr.size)
end
Is it possible to pass a block to << and if so, can anyone point me in the right way? 是否有可能将一个块传递给<<如果是这样,任何人都能以正确的方式指向我吗?
您可以使用方法调用语法来执行此操作:
arr.<<(part, &predicate)
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