Higher order#12

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abbygottlich wants to merge 6 commits intogh-pagesfrom

Commits on Nov 14, 2018

map function complete
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Commits on Nov 17, 2018

starting point
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Commits on Nov 20, 2018

Commits on Dec 6, 2018

refactored filter and map functions to no longer use methods; all 10 tests passing
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