Learning Functional Programming in Go

Identity rule examples

Under the + operator, the set of integers has an identity of 0.

Rule	Example
Left identity	0 + 1 == 1
Right identity	1 + 0 == 1

 

Notice that the operator is binary, that is, it takes two inputs, and those inputs must be of the same type.

The result of combining the identity element (sometimes called empty or zero) with x is always x.