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Re:PHP in a Tweet by 7Figures2Commas on Tuesday October 08, 2013 @05:29PM (#6517970)
1. Separate folding and addition.

2. ?

3. Profit.

Re:PHP in a Tweet by tel on Tuesday October 08, 2013 @06:59PM (#6518406)
Orthogonality and composability dramatically increase abstraction, code reuse, testability, and likelihood of writing correct code, both for library maintainers and library users.

Step 2 is actually extremely well known.