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website hosting service website hosting service 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. 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.

website hosting service 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..

website hosting service . 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.

website hosting service 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. The second and subsequent times the block is called, sum is set to the value returned by the block on the previous call. This way, sumcan be used to keep a running total. The final value of inject is the value returned by the block the last time it was called. Ruby does not have an inject method, but it's easy to write one.

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