Packages and Modules

Import Groups

Go import blocks list the packages a file uses.

import group An import block keeps related imports together and makes package dependencies visible.

Import Groups

phrase
import_groups.go
Replay: real traced execution (multi-file project)
package main

import (
	"fmt"
	"sort"
	"strings"
)

func main() {
	var phrase = "go modules"
	words := strings.Fields(phrase)
	sort.Strings(words)
	first := words[0]

	fmt.Println("phrase=", phrase)
	fmt.Println("count=", len(words))
	fmt.Println("first=", first)
}

package main

import (
	"fmt"
	"sort"
	"strings"
)

func main() {
	var phrase = "package main"
	words := strings.Fields(phrase)
	sort.Strings(words)
	first := words[0]

	fmt.Println("phrase=", phrase)
	fmt.Println("count=", len(words))
	fmt.Println("first=", first)
}

package main

import (
	"fmt"
	"sort"
	"strings"
)

func main() {
	var phrase = "import path"
	words := strings.Fields(phrase)
	sort.Strings(words)
	first := words[0]

	fmt.Println("phrase=", phrase)
	fmt.Println("count=", len(words))
	fmt.Println("first=", first)
}

  1. phrase ← "go modules", words ← []string{"go", "modules"}, first ← "go"

    9func main() {10  var phrase→ "go modules" = "go modules" //@phrase="package main", "import path"11  words→ []string{"go", "modules"} := strings.Fields(phrase"go modules")12  sort.Strings(words[]string{"go", "modules"})13  first→ "go" := words[0]"go"1415  fmt.Println("phrase=", phrase"go modules")16  fmt.Println("count=", len(words[]string{"go", "modules"}))17  fmt.Println("first=", first"go")18}
    outputphrase= go modules
count= 2
first= go

  1. phrase ← "package main", words ← []string{"package", "main"}, first ← "main"

    9func main() {10  var phrase→ "package main" = "package main"11  words→ []string{"package", "main"} := strings.Fields(phrase"package main")12  sort.Strings(words→ []string{"main", "package"})13  first→ "main" := words[0]"main"1415  fmt.Println("phrase=", phrase"package main")16  fmt.Println("count=", len(words[]string{"main", "package"}))17  fmt.Println("first=", first"main")18}
    outputphrase= package main
count= 2
first= main

  1. phrase ← "import path", words ← []string{"import", "path"}, first ← "import"

    9func main() {10  var phrase→ "import path" = "import path"11  words→ []string{"import", "path"} := strings.Fields(phrase"import path")12  sort.Strings(words[]string{"import", "path"})13  first→ "import" := words[0]"import"1415  fmt.Println("phrase=", phrase"import path")16  fmt.Println("count=", len(words[]string{"import", "path"}))17  fmt.Println("first=", first"import")18}
    outputphrase= import path
count= 2
first= import