Learning Functional Programming in Go

Writing a reduction function

Given the previous three rules, we can write a reduction function. When we run a reduction on an array of integers using addition, we seed our operation with a 0 (the identity element).

When we run a reduction on an array of integers using multiplication, we seed our operation with a 1 (the identity element).

That's the idea. The following table summarizes a number of possible reductions:

Type	Operation	Unit/zero/neutral value
ints	+	0
ints	*	1
string	+ (concat strings)	“”
bool	&&	true
bool	||	false
list	<< (concat list)	[]