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start a web hosting business start a web hosting business 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.

start a web hosting business 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. The thing that uses the iterator is simply a block of code associated with this method.

start a web hosting business There is no need to generate helper classes to carry the iterator state, as in Java and C++. In this, as in many other ways, Ruby is a transparent language. When you write a Ruby program, you concentrate on getting the job done, not on building scaffolding to support the language itself. Iterators are not limited to accessing existing data in arrays and hashes. As we saw in the Fibonacci example, an iterator can return derived values.

start a web hosting business This capability is used by the Ruby input/output classes, which implement an iterator interface returning successive lines (or bytes) in an I/O stream. f = File.open("testfile") f.each do |line| print line end f.close produces: This is line one This is line two This is line three And so on.

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