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low cost private jsp support low cost private jsp support ) 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. 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.

low cost private jsp support ] 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.[The find method is actually defined in module Enumerable, which is mixed into class Array.] Its implementation would look something like the following.

low cost private jsp support class Array def find for i in 0...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.

low cost private jsp support If the block returns true, the method returns the corresponding element. If no element matches, the method returns nil. The example shows the benefit of this approach to iterators. The Array class does what it does best, accessing array elements, leaving the application code to concentrate on its particular requirement (in this case, finding an entry that meets some mathematical criteria). Some iterators are common to many types of Ruby collections.

low cost private jsp support

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low cost private jsp support