Basics
Every Go program is made up of packages. Programs start running in package `main`.
By convention the pacckage name is the same as the last element of the import path. For instance, the `math/rand` package comprises files that begin with the statement `package rand`.
package main
import (
"fmt"
"math/rand"
)
func main() {
fmt.Println("My favorite number is", rand.Intn(10))
}Imports
It’s best practice to convert multiple import statements to a “factored” import statement:
package main
import "fmt"
import "math"
func main() {
fmt.Printf("This uses multiple import statements\n")
fmt.Printf("Now you have %g problems.\n", math.Sqrt(7))
}should be
package main
import (
"fmt"
"math"
)
func main() {
fmt.Printf("This uses a parenthesized \"factored\" import statement\n")
fmt.Printf("Now you have %g problems.\n", math.Sqrt(7))
}Exported names
In Go, a name is exported if it begins with a capital letter. When importing a package, you can refer only to its exported names. Any “unexported” names are not accessible from outside the package.