Populating a metafield with a truncated SKU String using custom variables

[Fildec]

Hello,

I am seeking help on a specific value using a custom variable.
My objective is to populate a single text line metafield with a segment of any of the skus in the variants.
In my current setup, I have the following line: 

{{ product.variants | map: "sku"}}

returning a string of all the SKUs of every variant. This code returns the entire SKU string, for example:

AB1234-56Z-7890-XY-CD1234-56Z-7890-XY. However, I am looking to modify this code so that it only returns the first two segments of the entire string, like: AB1234-56Z.

Is there a way to adjust the variable to achieve this truncation?

Thank you!

[maxdanko]

{%- assign some_string = "AB1234-56Z-7890-XY-CD1234-56Z-7890-XY" -%}

{%- assign splitted_string = some_string |  split: "-" -%}

{%- assign result = splitted_string[0] | append: '-' | append: splitted_string[1] -%}

{{ result }} // AB1234-56Z

[Fildec]

Thanks for the quick solution. 

It makes sense, but when I try to put any sort of variant I get an error saying it's invalid.
Not just if I wanna pull a SKU, even if I put product.title it says it's invalid:

Any suggestion on how to use variants when using the {%- logic?

[DaveMcV · Accepted solution]

Hi Fildec,

Thanks for raising this. There seems to be a bug in how the variables are being validated after splitting which we'll need to look into. I've logged it and will raise it with the team on Monday.

As a workaround for now, you can iterate through the array after splitting instead, which will pass validation.

{% for variant in product.variants %}
    {% assign sku = variant.sku %}
    {% assign parts = sku | split: '-' %}
    {% assign first_two_parts = "" %}
  
    {% for part in parts %}
        {% if forloop.index <= 2 %}
            {% assign first_two_parts = first_two_parts | append: part | append: '-' %}
        {% else %}
            {% break %}
        {% endif %}
    {% endfor %}

    {% assign first_two_parts = first_two_parts | remove: '-' | append: '-' %}

    {{ first_two_parts }}
{% endfor %}

Hope that helps!

[Fildec]

Thank you @DaveMcV 
The code is accepted by the system. 

Since I have multiple variants it was creating some errors when running but after adding a couple of filters to remove the extra data, it works. 

Thank you!