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{{ $list := (where .Site.Pages "Section" "blablabla") }}
{{ $len := (len $list) }}

{{ range $index, $element := $list }}
  {{ if eq (add $index 1) $len }} do something {{ end }}
{{ end }}

<!-- Example from my Hugo Template: -->

{{ $list := (.Site.Menus.main) }}
{{ $len := (len $list) }}

{{ range $index, $element := $list }}
  <li class="dib lh-copy"><a{{ if eq (add $index 1) $len }} class="ph2"{{ else }} class="br ph2"{{ end }} href="{{ .URL | absURL }}">{{ .Pre }} {{ .Name }}</a></li>
{{ end }}