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cheap private java development cheap private java development 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. For example, we could write a simple function that returns members of the Fibonacci series up to a certain value.

cheap private java development [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. In the definition of the block, the argument list appears between vertical bars.

cheap private java development 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.) Although it is common to pass just one value to a block, this is not a requirement; a block may have any number of arguments. What happens if a block has a different number of parameters than are given to the yield? By a staggering coincidence, the rules we discuss under parallel assignment come into play (with a slight twist: multiple parameters passed to a yieldare converted to an array if the block has just one argument).

cheap private java development Parameters to a block may be existing local variables; if so, the new value of the variable will be retained after the block completes. This may lead to unexpected behavior, but there is also a performance gain to be had by using variables that already exist.[For more information on this and other ``gotchas,'' see the list beginning on page 127; more performance information begins on page 128.] A block may also return a value to the method. The value of the last expression evaluated in the block is passed back to the method as the value of the yield.

cheap private java development

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cheap private java development