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affordable web site hosting affordable web site hosting 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.open("testfile") f.each do |line|  print line end f.

affordable web site hosting close produces: This is line one This is line two This is line three And so on... Let's look at just one more iterator implementation. The Smalltalk language also supports iterators over collections.

affordable web site hosting 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. 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.

affordable web site hosting 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. In this case we'll add it to the Array class, while on page 100 we'll see how to make it more generally available. class Array   def inject(n)      each { |value| n = yield(n, value) }      n   end   def sum     inject(0) { |n, value| n + value }   end   def product     inject(1) { |n, value| n * value }   end end [ 1, 2, 3, 4, 5 ].sum » 15 [ 1, 2, 3, 4, 5 ].

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