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inexpensive web hosting church inexpensive web hosting church 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. 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.

inexpensive web hosting church 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. 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.

inexpensive web hosting church 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...

inexpensive web hosting church Let's look at just one more iterator implementation. The Smalltalk language also supports iterators over collections. If you ask Smalltalk programmers to sum the elements in an array, it's likely that they'd use the inject function. sumOfValues "Smalltalk method" ^self values inject: 0 into: [ :sum :element | sum + element value] inject works like this. The first time the associated block is called, sum is set to inject's parameter (zero in this case), and element is set to the first element in the array.

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