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low cost private jsp support [Programming-language buffs will be pleased to know that the keyword yield was chosen to echo the yield function in Liskov's language CLU, a language that is over 20 years old and yet contains features that still haven't been widely exploited by the CLU-less.] Let's start with a trivial example. def threeTimes yield yield yield end threeTimes { puts "Hello" } produces: Hello Hello Hello The block (the code between the braces) is associated with the call to the method threeTimes. Within this method, yield is called three times in a row. Each time, it invokes the code in the block, and a cheery greeting is printed.
low cost private jsp support What makes blocks interesting, however, is that you can pass parameters to them and receive values back from them. For example, we could write a simple function that returns members of the Fibonacci series up to a certain value.[The basic Fibonacci series is a sequence of integers, starting with two 1's, in which each subsequent term is the sum of the two preceding terms. The series is sometimes used in sorting algorithms and in analyzing natural phenomena.] def fibUpTo(max) i1, i2 = 1, 1 # parallel assignment while i1 <= max yield i1 i1, i2 = i2, i1+i2 end end fibUpTo(1000) { |f| print f, " " } produces: 1 1 2 3 5 8 13 21 34 55 89 144 233 377 610 987 In this example, the yield statement has a parameter.
low cost private jsp support This value is passed to the associated block. In the definition of the block, the argument list appears between vertical bars. In this instance, the variable f receives the value passed to the yield, so the block prints successive members of the series. (This example also shows parallel assignment in action. We'll come back to this on page 75.
low cost private jsp support
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