Golang模板：如何在变量中定义数组？

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.

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.

map or array type is not supported, but i pass the map or array variable from controller to template, then use {{index .Varible KEY}} to get the map or array value for forward operations. wish this could help you.

You can use the sprig library to help here (I'm using this for helm templates - which are go templates, but helm has sprig builtin)

$myList := list  0 1 2
$new = append $myList 3

From Sprig Lists