Golang模板：如何在变量中定义数组？

Question

What would be the correct syntax to define an array variable inside a go template ? (here a HTML template). Here's what I tried :

{{define "template"}}
    {{ $x:=[]int{0,1,2} }}{{$x[0]}}
{{end}}

The error log says : unexpected "[" in command

Thanks.

Answer 1

there is no built-in way to do what you want to achieve. See the arguments on what you can do with the arguments and the pipeline.

But you could easily define your own function to achieve your goal:

package main

import (
    "html/template"
    "os"
)

func main() {
tmpl := `
{{ $slice := mkSlice "a" 5 "b" }}
{{ range $slice }}
     {{ . }}
{{ end }}
`
    funcMap := map[string]interface{}{"mkSlice": mkSlice}
    t := template.New("demo").Funcs(template.FuncMap(funcMap))
    template.Must(t.Parse(tmpl))
    t.ExecuteTemplate(os.Stdout, "demo", nil)
}

func mkSlice(args ...interface{}) []interface{} {
    return args
}

Playground.