A bit of help with: IF element is SINGLE then, LAST then, ELSE that

[idarek]

Hi,
I got a simple code like that which is a part of Schema script <script type="application/ld+json">

[
{{ $counter := 0 }}
{{ range .Paginator.Pages }}
{{ $counter = add $counter 1 }}
{
"name": {{ .Title }},
 "id": {{ $counter }}
}
{{ end}}
]

The problem is

• when is single element, last } is without comma ,.
• when is multiple items, after each } there shall be comma , apart of last, like below.

[
  {
    "name": "First",
    "id": 1
  },
  {
    "name": "Second",
    "id": 2
  },
  {
    "name": "Third and last",
    "id": 3
  }
]

How to form something like

{{ if eq $counter 1 }} {{ else if last $counter }} {{ else }} , {{ end }}

ps. max $counter is equal value in config.toml and paginate = 16 but can be less than that.

Thank you in advance.
Look simple but struggle to bite that.

I will share my output in Tips & Tricks here on what I am working on when finalised as it may be helpful for others.

[jmooring]

{{ $s := slice "a" "b" "c" }}
{{ range $k, $_ := $s }}
  {{ if $k }}
    ,
  {{ end }}
  {{ . }}
{{ end }}

[idarek]

Thanks,
is it possible to use slice with range where?

Here is code

<script type="application/ld+json">
    {
      "@context":"https://schema.org",
      "@type":"ItemList",
      "itemListElement":[
      {{ $counter := 0 }}
      {{ range where .Paginator.Pages "Params.hidden" "ne" true }}
	{{ $counter = add $counter 1 }}
        {
          "@type":"ListItem",
          "position": {{ $counter }},
          "url": {{ .Permalink }}
        } <!-- blank if singe, comma if more than one, blank if last -->
	    {{ end }}
      ]
    }
</script>

[jmooring]

{{ $s := slice
  (dict "a" "wibble" "b" "wobble")
  (dict "a" "wibble" "b" "wubble")
  (dict "a" "foo" "b" "baz")
}}
{{ range $k, $_ := where $s "a" "wibble" }}
  {{ if $k }}
    ,
  {{ end }}
  {{ .b }}
{{ end }}

--> wobble , wubble

[idarek]

I am sorry, but I don’t know how to implement that into the above range.

[jmooring]

diff --git a/layouts/_default/home.html b/layouts/_default/home.html
index a59a27e8b..0c327f4a6 100644
--- a/layouts/_default/home.html
+++ b/layouts/_default/home.html
@@ -16,14 +16,15 @@ <h1>{{ .Title }}</h1>
     "@context":"https://schema.org",
     "@type":"ItemList",
     "itemListElement":[
-    {{ $counter := 0 }}
-    {{ range where .Paginator.Pages "Params.hidden" "ne" true }}
-{{ $counter = add $counter 1 }}
+    {{ range $k, $_ := where .Paginator.Pages "Params.hidden" "ne" true }}
+      {{ if $k }}
+        ,
+      {{ end }}
       {
         "@type":"ListItem",
-        "position": {{ $counter }},
+        "position": {{ add $k 1 }},
         "url": {{ .Permalink }}
-      } <!-- blank if singe, comma if more than one, blank if last -->
+      }
     {{ end }}
     ]
   }

[idarek]

Wow, that’s great. Thank you.

BTW, it’s a nice looking way to present a difference with - and +. Haven’t seen that before.

[jmooring]

git diff

https://en.wikipedia.org/wiki/Diff