GO Template Example

tpl1.go

package main
import (
	"text/template"
	"os"
)
func main() {
	type Inner struct {
		A string
	}
	type Outer struct {
		Inner
	}
	o := Outer{
		Inner: Inner{A : "123"},
	}
	tpl := template.Must(template.New("").Parse(`{{ .A }}`))
	tpl.Execute(os.Stdout, &o)
}

tpl2.go

package main

import (
	"text/template"
	"os"
)

func main() {
	type Inner struct {
		A string
	}
	type Outer struct {
		Inner
	}

	type NA struct {
		O []Outer
	}

	na := NA{
		O: []Outer{
			{
				Inner: Inner{A: "123"},
			},
		},
	}
	tpl := template.Must(template.New("").Parse(`
{{ define "t2" }}
{{ printf "%v" .A }}
{{ end }}

{{ range $svc := .O }}
	{{ template "t2" $svc }}
{{ end }}
`))
	tpl.Execute(os.Stdout, &na)
}

tpl3.go

package main

import (
	"text/template"
	"os"
)

func main() {
	type Inner struct {
		A string
	}
	type Outer struct {
		Inner
	}

	type NA struct {
		O []Outer
	}

	na := NA{
		O: []Outer{
			{
				Inner: Inner{A: "1"},
			},
			{
				Inner: Inner{A: "2"},
			},
			{
				Inner: Inner{A: "3"},
			},
			{
				Inner: Inner{A: "4"},
			},
		},
	}
	tpl := template.Must(template.New("").Parse(`
{{- range $svc := .O }}
      {{ printf "%v" .A -}}
{{ end -}}
{{- range $svc := .O }}
    {{ printf "%v" .A -}}
{{ end -}}
`))
	tpl.Execute(os.Stdout, &na)
}