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cheap private java development .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. If no element matches, the method returns nil.
cheap private java development 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. We've looked at find already. Two others are each and collect.
cheap private java development each is probably the simplest iterator---all it does is yield successive elements of its collection. [ 1, 3, 5 ].each { |i| puts i } produces: 1 3 5 The each iterator has a special place in Ruby; on page 85 we'll describe how it's used as the basis of the language's for loop, and starting on page 102 we'll see how defining an each method can add a whole lot more functionality to your class for free. Another common iterator is collect, which takes each element from the collection and passes it to the block. The results returned by the block are used to construct a new array.
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