How to filter even and odd elements?-CodePudding

{{ if eq ($key % 2) 0 }} gives: unexpected "%" in operand

{{ if $key % 2 == 0 }} gives: unexpected "%" in operand

So how do I find even and odd keys ?

CodePudding user response：

Hugo has Math functions

First find reminder than check it in a if clause Modulus of two integers can be find with mod $number 2

        {{- $reminder := mod $key  2 }}
        {{ if eq $reminder  0 }}
          <p >{{- $value.name -}}</p>
        {{ else }}
          <p>{{- $value.name -}}</p>
        {{ end }}

CodePudding user response：

Toggle a boolean variable to detect odd and even elements in a range.

 {{- $odd := false}}
 {{range .}}
    {{$odd = not $odd}}
    {{if $odd}}odd:  {{else}}even: {{end}}{{.}}
 {{end}}

Run an example on the playground.

The first iteration is considered to be odd. Initialize with $odd := true to make the first iteration even.

This approach works with Go templates in any context (not just Hugo). This approach also works when ranging over a map.