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website hosting service website hosting service 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. In this instance, the variable f receives the value passed to the yield, so the block prints successive members of the series.

website hosting service (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). Parameters to a block may be existing local variables; if so, the new value of the variable will be retained after the block completes.

website hosting service 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. This is how the find method used by class Array works.

website hosting service [The find method is actually defined in module Enumerable, which is mixed into class Array.] Its implementation would look something like the following. class Array   def find     for i in 0...

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