hugo/docs/content/en/functions/append.md

title	description	categories	menu	keywords	signature	relatedfuncs
append	`append` appends one or more values to a slice and returns the resulting slice.	functions	docs parent functions	collections	COLLECTION | append VALUE [VALUE]... COLLECTION | append COLLECTION	last first where slice

An example appending single values:

{{ $s := slice "a" "b" "c" }}
{{ $s = $s | append "d" "e" }}
{{/* $s now contains a []string with elements "a", "b", "c", "d", and "e" */}}

The same example appending a slice to a slice:

{{ $s := slice "a" "b" "c" }}
{{ $s = $s | append (slice "d" "e") }}

If a slice contains other slices, further slices will be appended as values:

{{ $s := slice (slice "a" "b") (slice "c" "d") }}
{{ $s = $s | append (slice "e" "f") (slice "g" "h") }}
{{/* $s now contains a [][]string containing four slices:  ["a" "b"],  ["c" "d"], ["e" "f"], and ["g" "h"] */}}

The append function works for all types, including Pages.