Golang templates : how to define array in a variable?

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.

seong · Accepted Answer · 2014-07-29 10:28:26Z

20

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.

answered Jul 29, 2014 at 10:28

seong

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Comments

Rhubarb · Accepted Answer · 2019-09-16 14:48:21Z

9

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

answered Sep 16, 2019 at 14:48

Rhubarb

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2 Comments

Pieter Over a year ago

any way to create a map in helm/go template ?

Kartik Shah Over a year ago

What can we do if we have strings and not integers?

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