How to show total number of variants of product?

Step 1: Login to your shopify store

Step 2: Click on Online store > Themes

Step 3: From the Actions drop-down select Edit code.

Step 4: Open a file where you want show total number of variant of product

Step 5 : Paste this code :

  <!---show total number of variants available -->
   {% assign num = 0 %}
    {% assign temp = 0 %}
    {% for variant in product.variants %}
       {% if variant.available %}       
          {% capture temp %}{{ num | plus: 1 }}{% endcapture %} 
       {% endif %}
    {% assign num = temp %}
    {% endfor %}  
 {{ num }}  Available


Step 6: Save

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