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affordable web site hosting affordable web site hosting 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.) 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.

affordable web site hosting 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. 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.

affordable web site hosting 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.[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.

affordable web site hosting ..size       value = self[i]       return value if yield(value)     end     return nil   end end [1, 3, 5, 7, 9].find {|v| v*v > 30 } 7 This passes successive elements of the array to the associated block. If the block returns true, the method returns the corresponding element.

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