6 kyu
Function composition
9,468 of 9,469matthewglover
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Functional Programming
Fundamentals
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JS version update
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C++ translation added.
I think I must be missing something obvious - the first two test cases listed seem to be incorrect
Test.assertEquals(compose(multTwo, addOne)(5), 12, 'compose two functions')
5*2 = 10 10+1 = 11 Though the test case states 12
Test.assertEquals(compose(addOne, multTwo, addOne, addOne)(2), 9, 'compose four functions') 2+1 = 3 3*2 = 6 6+1 = 7 7+1 = 8 Though the test case states 9
Ignore me - I didn't realise that the functions are applied from right to left (in terms of the arguments passed into the compose function)