private tomcat

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private tomcat private tomcat ..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.

private tomcat 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. We've looked at find already.

private tomcat Two others are each and collect. 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.

private tomcat The results returned by the block are used to construct a new array. For instance: ["H", "A", "L"].collect { |x| x.succ } » ["I", "B", "M"] Ruby Compared with C++ and Java It's worth spending a paragraph comparing Ruby's approach to iterators to that of C++ and Java. In the Ruby approach, the iterator is simply a method, identical to any other, that happens to call yield whenever it generates a new value.

private tomcat

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private tomcat