hugo/docs/content/en/functions/collections/Group.md

title, description, categories, keywords, params, aliases

title	description	categories	keywords	params	aliases
collections.Group	Returns a map by grouping the given page collection (slice) by a specific key.			functions_and_methods aliases returnType signatures group page.PageGroup collections.Group KEY PAGES	/functions/group

{{ $new := .Site.RegularPages | first 10 | group "New" }}
{{ $old := .Site.RegularPages | last 10 | group "Old" }}
{{ $groups := slice $new $old }}
{{ range $groups }}
  <h3>{{ .Key }}{{/* Prints "New", "Old" */}}</h3>
  <ul>
    {{ range .Pages }}
      <li>
        <a href="{{ .RelPermalink }}">{{ .LinkTitle }}</a>
        <div class="meta">{{ .Date.Format "Mon, Jan 2, 2006" }}</div>
      </li>
    {{ end }}
  </ul>
{{ end }}

The page group you get from group is of the same type you get from the built-in group methods in Hugo. The example above can be paginated.