2017-04-11 04:53 阅读 70


How to use an if condition within a range iteration loop in go?

package main

import "os"
import "text/template"

const t = `{{range $i, $v := .}}{{$i}} {{$v}}{{if $i gt 0}}, {{end}}

func main() {
    d := []string{"a", "b", "c"}
    template.Must(template.New("").Parse(t)).Execute(os.Stdout, d)

  • 点赞
  • 写回答
  • 关注问题
  • 收藏
  • 复制链接分享

1条回答 默认 最新

  • 已采纳
    drll42469 drll42469 2017-04-11 05:05

    If you check the error returned from Execute, you will find that the template is attempting to pass arguments to the non-function $i. The correct syntax is:

    const t = `{{range $i, $v := .}}{{$i}} {{$v}}{{if gt $i 0}}, {{end}}

    The arguments follow the function gt. The function gt is not an infix operator.

    playground example

    If your goal is to print a comma separated list, then write it like this:

    const t = `{{range $i, $v := .}}{{if $i}}, 
    {{end}}{{$i}} {{$v}}{{end}}

    playground example

    点赞 评论 复制链接分享