How to Remove comma for the last object in nested for loop? - portal

Question

I want to remove the comma from the last object in nested for loop:
[{% for item1 in articles.results.entities %}
{% for item2 in articles1.results.entities %}
{% if item1.knowledgearticleid != item2.knowledgearticleid %}
{
"Id":"{{item1.knowledgearticleid}}",
"Title":"{{item1.title}}",
"Articlepublicumber":"{{item1.articlepublicnumber}}",
"Description":"{{item1.description}}"
}
{% endif %}
{% endfor %}
{% unless forloop.last %},{% endunless %}
{% endfor %}]
But this is not working; it is giving me duplicate commas:
[
{
"Id": "ddcb41c6-1f33-ea11-a813-000d3a3be5cf",
"Title": "1 Test1",
"Articlepublicumber": "KA-01992",
"Description": "Test1"
},,
{
"Id": "9564dc21-9df6-414b-ab99-da4ba534fd83",
"Title": "Test2",
"Articlepublicumber": "KA-03363",
"Description": "Test2"
}
]

Answer 1

Identical issue in terms of Shopify liquid snippet discussed here and this is common scenario with concatenation in any language.
With each accepted iteration, add a comma and then the “needed item”.  Except if this is the first accepted iteration, don't add the comma.
I just manage to modify your code, but test it on your end. But you got the idea right?
[{% assign list_items = "" %}
{% for item1 in articles.results.entities %}
{% for item2 in articles1.results.entities %}
{% if item1.knowledgearticleid != item2.knowledgearticleid %}
{% unless list_items == "" %}
{% assign list_items = "zzz" %}
{
"Id":"{{item1.knowledgearticleid}}",
"Title":"{{item1.title}}",
"Articlepublicumber":"{{item1.articlepublicnumber}}",
"Description":"{{item1.description}}"
}
{% endunless %}
{% unless list_items == "zzz" %}
,{
"Id":"{{item1.knowledgearticleid}}",
"Title":"{{item1.title}}",
"Articlepublicumber":"{{item1.articlepublicnumber}}",
"Description":"{{item1.description}}"
}
{% endunless %}
{% endif %}
{% endfor %}
{% endfor %}]