Learning Functional Programming in Go

The Filter function

The first HOF that we exploit is the Filter function:

} else {       cars := LoadCars()       PrintCars("ByMake - Honda", cars.Filter(ByMake("Honda")))

You will see the following output:

ByMake - Honda-----------------------car: Honda Accordcar: Honda Accord ES2car: Honda CR-V

 The Filter function is in the cars.go file. Observe the fn argument. It is passed into the Filter function and later called with a car parameter. If fn(car)--that is, ByMake("Honda")--returns true, then the car is added to the collection:

func (cars Collection) Filter(fn FilterFunc) Collection {       filteredCars := make(Collection, 0)       for _, car := range cars {              if fn(car) {                     filteredCars = append(filteredCars, car)              }       }       return filteredCars}

When we define the Filter ...