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affordable web hosting web space provider This is where the magic starts. Within the method, the block may be invoked, almost as if it were a method itself, using the yield statement. Whenever a yield is executed, it invokes the code in the block. When the block exits, control picks back up immediately after theyield.[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.
affordable web hosting web space provider ] 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. What makes blocks interesting, however, is that you can pass parameters to them and receive values back from them.
affordable web hosting web space provider 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. This value is passed to the associated block.
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