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

title	description	keywords	categories	menu	signature	relatedfuncs
shuffle	Returns a random permutation of a given array or slice.	ordering	functions	docs parent functions	shuffle COLLECTION	seq

{{ shuffle (seq 1 2 3) }} → [3 1 2] 
{{ shuffle (slice "a" "b" "c") }} → [b a c] 

The result will vary from one build to the next.