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low cost private jsp web hosting 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. The second and subsequent times the block is called, sum is set to the value returned by the block on the previous call.
low cost private jsp web hosting 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. 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 ].
low cost private jsp web hosting sum » 15 [ 1, 2, 3, 4, 5 ].product » 120 Although blocks are often the target of an iterator, they also have other uses. Let's look at a few. Blocks for Transactions Blocks can be used to define a chunk of code that must be run under some kind of transactional control. For example, you'll often open a file, do something with its contents, and then want to ensure that the file is closed when you finish.
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