Chapter 4 - Packages
Exercise 1: Importing Packages
Solution
To download and install a package at https://github.com/jaymcgavren/car
, you’d run:
$ go get github.com/jaymcgavren/car
This program will call all the functions contained in that package and its sub-packages:
package main
// Remember, the import path for a package is its path
// within the "src" subdirectory in your workspace.
import (
"github.com/jaymcgavren/car"
"github.com/jaymcgavren/car/headlights"
// All the .go source files in a package directory are
// combined into a single package. So this one line
// will give you access to the functions from both the
// amplifier.go and speakers.go source files.
"github.com/jaymcgavren/car/stereo"
"github.com/jaymcgavren/car/wheels"
)
func main() {
// Precede all function names with the package name.
car.OpenDoor()
// The package name is usually the same as the last
// segment of the import path. So if you import the
// "car/headlights" package, you'll refer to it as just
// "headlights".
headlights.TurnOn()
stereo.TurnOn()
stereo.BoostBass()
wheels.Steer()
wheels.Accelerate()
}
Output:
Opening door
Shining headlights
Playing music
Bwomp bwamp BWOOOOMP
Turning front wheels
Peeling out!