Conditionals

eq, lt, le, gt, ge, not

{{$var1 := "dog"}}
{{$var2 := "cat"}}
{{if eq $var1 $var2}}
<!--or if not (eq $var1 $var2) -->
  True
{{else}}
  False
{{end}}

and, or

{{if and (lt $var1 $var2) (lt $var1 $var3)}}

List all pages on the site and if it is the current page, style it differently.

{{$title := .Title }}
<!-- Stores the title of the current page.-->
{{range .Site.Pages}}
<li>
  <a
    href="{{.Permalink}}"
    style="{{if eq .Title $title}} background-color:yellow; {{end}}"
    >{{.Title}}</a
  >
</li>
{{end}}

BUT: this lists tags and categories as well!

Functions Data Files