Learning Functional Programming in Go

Generics revisited

In the last chapter, we discussed some of the benefits of generics:

• Type safety
• Eliminates the need to write repetitive, boilerplate code
• Reuses and shares code for different types
• Enforces consistent APIs across different types
• Time spent optimizing generic code has more impact
• Don’t need to re-implement algorithms that are hard to get right
• Able to specify domain constraints

Given the following type definitions:

type Car struct {   Make, Model string   Price Dollars}type Truck struct {   Make, Model string   BedSize int   Price Dollars}price := func (c T) Dollars {   return c.Price}

Instead of writing both of these:

type CarSlice []Carfunc (rcv CarSlice) SumDollars(fn func(Car) Dollars) (result Dollars) {   for _, v := range rcv ...