Replaced halvesies using append with halvesies using map()
Use map() in word_lengths to map a function over word list
Created sum_numbers function using reduce(). Also, to shorter code, directly return reduce(sums, number_list)
Use reduce() in mult_numbers. Takes 2 numbers and multiplies using reduce.
Use reduce to join strings
Move internal function 'sums' out from sum_numbers to use in average. Write average using reduce.
Use filter for all_odd and all_even. Work in progress on largest
Tested and fixed is_even, is_odd (var names did not match)
Fixed largest using REDUCE, not filter. Trying to converge on 1 number using 2 inputs -- reduce.
Use reduce to rewrite smallest in same fashion as largest.
All functions use reduce, filter or map. Pass all tests.