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## if
if returns false for false booleans, empty strings, empty slices
{{ if .Foo }} ... {{ end }}
{{ if not .Foo }} ... {{ end }}
## Slices: iterate, get length
{{ range .Slice }} ... {{ end }}
{{ len .Slice }}
## Variables
{{ $isAdmin := .IsAdmin }}
{{ if $isAdmin }} ... {{ end }}
## Include another template
{{ template "foo.html" }}
This includes a template named "foo".