counter.py

# Higher order function and recursive combined. 
count = lambda x, counter, func: counter == x if counter else count(x, func(counter), func)

# some variations using the above function
increment = lambda x: x + 1
increment_by_two = lambda x: x + 2
double = lambda x: x * 2

decrement_by_x = lambda x: lambda y: x - y
decrement = lambda x: decrement_by_x(x)(1)
decrement_by_two = lambda x: decrement_by_x(x)(2)

count_to = lambda to, counter: count(to, counter, increment)
count_double = lambda to, counter: count(to, counter, increment_by_two)
multiply = lambda to, counter: count(to, counter, double)
count_down = lambda min, counter: count(min, counter, decrement)