list-functions.yaml

# define list
# -> [1 2 3 4 5]
{{ $myList := list 1 2 3 4 5 }}

# append item
# [1 2 3 4 5] -> [1 2 3 4 5 6]
{{- $myList = append $myList 6 }}

# prepend item
# [1 2 3 4 5 6] -> [0 1 2 3 4 5 6]
{{- $myList = prepend $myList 0 }}

# concat item
# [0 1 2 3 4 5 6], [7 8], [9] -> [0 1 2 3 4 5 6 7 8 9]
{{- $myList2 := list 7 8 }}
{{- $myList3 := list 9 }}
{{- $myList = concat $myList $myList2 $myList3 }}

{{- range $myList }}
apiVersion: v1
kind: ServiceAccount
metadata:
  name: {{ printf "serviceAccount-%d" . }}
{{- end }}

{{- /*
##### output #####
# apiVersion: v1
# kind: ServiceAccount
# metadata:
#   name: serviceAccount-1
# apiVersion: v1
# kind: ServiceAccount
# metadata:
#   name: serviceAccount-2
# ...
# kind: ServiceAccount
# metadata:
#   name: serviceAccount-9
*/ -}}

# has & index function
{{- if has 4 $myList }}
apiVersion: v1
kind: ServiceAccount
metadata:
  # myList[4]
  name: {{ printf "myList%d" ( index $myList 4 ) }}
{{- end }}

{{- /*
##### output #####
# apiVersion: v1
# kind: ServiceAccount
# metadata:
#   # myList[4]
#   name: myList4
*/ -}}

{{- $seqList := seq -2 2 10 }}
{{- $seqList = toString $seqList }}
{{- $seqList = regexSplit " " $seqList -1 }}
{{- range $seqList }}
apiVersion: v1
kind: ServiceAccount
metadata:
  name: {{ printf "serviceAccount-%s" . }}
{{- end }}

{{- println $seqList }}
# [-2 0 2 4 6 8 10]

{{- /*
##### output #####
# apiVersion: v1
# kind: ServiceAccount
# metadata:
#   name: serviceAccount--2
# apiVersion: v1
# kind: ServiceAccount
# metadata:
#   name: serviceAccount-0
# ...
# kind: ServiceAccount
# metadata:
#   name: serviceAccount-10
*/ -}}