How index starts with 1 in revel Framework

  <tr>
      <td>rank</td>
      <td>abc</td>
  </tr>
  {{ range $index,$abc := .abc }}
     <tr>
      <td>{{$index}}</td> // 0
      <td>{{$abc}}</td>
     </tr>
  {{end}}

1. how to {{$index}} starts with 1

   {{add $index 1}} - unction "add" not defined

   {{$index + 1}} - illegal number syntax: "+"

You can pass a custom function into your controller's ViewArgs as a variable.

controller.ViewArgs["addOne"] = func (i int64) {
    return i+1
}

You can then use $.addOne to access the function in a loop. To use it as a function, you have to add a call keyword before it:

  <tr>
      <td>rank</td>
      <td>abc</td>
  </tr>
  {{ range $index, $abc := .abc }}
     <tr>
      <td>{{call $.addOne $index}}</td> // $index + 1
      <td>{{$abc}}</td>
     </tr>
  {{end}}