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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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