Add Helper 'index': get elem of array with the index

examples/helpers/example.txt

@@ -25,7 +25,7 @@
 {{abbrev 5 "hello world"}}:                                                         he...
 {{abbrevboth 5 10 "1234 5678 9123"}}:                                               ...5678...
 {{initials "First Try"}}:                                                           FT
-{{randNumeric 3}}:                                                                  146
+{{randNumeric 3}}:                                                                  528
 {{- /*{{wrap 80 $someText}}*/}}:
 {{wrapWith 5 "\t" "Hello World"}}:                                                  Hello	World
 {{contains "cat" "catch"}}:                                                         true
@@ -45,6 +45,9 @@
 {{regexReplaceAllLiteral "a(x*)b" "-ab-axxb-" "${1}"}}:                             -${1}-${1}-
 {{regexSplit "z+" "pizza" -1}}:                                                     [pi a]
 
+# Get one specific method on array method using index
+{{ index .Service.Method 1 }}:                                                      name:"Iii" input_type:".dummy.Dummy2" output_type:".dummy.Dummy1" options:<> 
+
 # Sprig: advanced
 {{if contains "cat" "catch"}}yes{{else}}no{{end}}:   yes
 {{1 | plural "one anchovy" "many anchovies"}}:       one anchovy

examples/helpers/example.txt.tmpl

@@ -46,6 +46,9 @@
 {{`{{regexReplaceAllLiteral "a(x*)b" "-ab-axxb-" "${1}"}}`}}:                             {{regexReplaceAllLiteral "a(x*)b" "-ab-axxb-" "${1}"}}
 {{`{{regexSplit "z+" "pizza" -1}}`}}:                                                     {{regexSplit "z+" "pizza" -1}}
 
+# Get one specific method on array method using index
+{{`{{ index .Service.Method 1 }}`}}:                                                      {{ index .Service.Method 1 }}
+
 # Sprig: advanced
 {{`{{if contains "cat" "catch"}}yes{{else}}no{{end}}`}}:   {{if contains "cat" "catch"}}yes{{else}}no{{end}}
 {{`{{1 | plural "one anchovy" "many anchovies"}}`}}:       {{1 | plural "one anchovy" "many anchovies"}}

helpers/helpers.go

@@ -3,6 +3,7 @@ package pgghelpers
 import (
 	"encoding/json"
 	"fmt"
+	"reflect"
 	"regexp"
 	"strings"
 	"text/template"
@@ -90,6 +91,16 @@ var ProtoHelpersFuncMap = template.FuncMap{
 	"trimstr": func(cutset, s string) string {
 		return strings.Trim(s, cutset)
 	},
+	"index": func(array interface{}, i int) interface{} {
+		slice := reflect.ValueOf(array)
+		if slice.Kind() != reflect.Slice {
+			panic("Error in index(): given a non-slice type")
+		}
+		if i < 0 || i >= slice.Len() {
+			panic("Error in index(): index out of bounds")
+		}
+		return slice.Index(i).Interface()
+	},
 	"snakeCase":               xstrings.ToSnakeCase,
 	"getProtoFile":            getProtoFile,
 	"getMessageType":          getMessageType,