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private tomcat 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.
private tomcat 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.
private tomcat 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.
private tomcat
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