collections.Index

Each indexed item must be a map or a slice:

{{ $s := slice "a" "b" "c" }}
{{ index $s 0 }} → a
{{ index $s 1 }} → b

{{ $m := dict "a" 100 "b" 200 }}
{{ index $m "b" }} → 200

Use two or more keys to access a nested value:

{{ $m := dict "a" 100 "b" 200 "c" (slice 10 20 30) }}
{{ index $m "c" 1 }} → 20

{{ $m := dict "a" 100 "b" 200 "c" (dict "d" 10 "e" 20) }}
{{ index $m "c" "e" }} → 20

You may also use a slice of keys to access a nested value:

{{ $m := dict "a" 100 "b" 200 "c" (dict "d" 10 "e" 20) }}
{{ $s := slice "c" "e" }}
{{ index $m $s }} → 20

Use the collections.Index function to access a nested value when the key is variable. For example, these are equivalent:

{{ .Site.Params.foo }}

{{ $k := "foo" }}
{{ index .Site.Params $k }}