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by Mon_Ouie
4893 days ago
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Methods that simply behave differently depending on whether or not an argument is given. For example, passing nil (or any other object) to inject is different from passing nothing. [1, 2, 3].inject(:+)
[1, 2, 3].inject(0, :+)
[1, 2, 3].inject(nil, :+) # doesn't work
Rubinius uses a magic ``undefined`` value for this: def inject(initial=undefined, sym=undefined, &block)
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