Logic
From Shopify Wiki
Logic are conditional Liquid statements.
Example of a logic statement
Lets say we are working on product.liquid template and want to display the message "Free shipping", but only on products whose price is greater than $100. Since the product will either have a price greater than $100 or less than $100, the if logic statement is the most appropriate statement to use...
{% if product.price > 100 %}
Free Shipping
{% else %}
No free shipping
{% end if %}
Notice how we use the {% %} logic tags and not the {{ }} output tags
Operators
You can use different operators when using logic statements...
- == - Equal