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November 15, 2015 20:43
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Trace of a simple foldLeft
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| foldLeft(List(1,2,3), 0) (_ + _) | |
| foldLeft(Cons(1, Cons(2, Cons(3, Nil))), 0) (_ + _) | |
| foldLeft(Cons(2, Cons(3, Nil)), (0 + 1)) (_ + _) | |
| foldLeft(Cons(3, Nil), ((0 + 1) + 2)) (_ + _) | |
| foldLeft(Nil, (((0 + 1) + 2) + 3)) (_ + _) | |
| (((0 + 1) + 2) + 3)) |
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