Available Liquid conditional operators
When used in conditional statements (if, unless), some Liquid values are treated as true, and some are treated as false.
In Liquid, null and the Boolean value false are treated as false; everything else is treated as true. For example, empty strings and empty arrays are treated as true.
{% assign empty_string = "" %}
{% if empty_string %}
<p>This will render.</p>
{% endif %}
Test for empty strings and arrays using the special value empty if necessary.
{% unless page.title == empty %}
<h1>{{ page.title }}</h1>
{% endunless %}
Test the size of Liquid types using the special size property.
{% if page.children.size > 0 %}
<ul>
{% for child in page.children %}
<li>{{ child.title }}</li>
{% endfor %}
</ul>
{% endif %}
Summary
| Operator | True | False |
|---|---|---|
| True | × | |
| False | × | |
| Null | × | |
| String | × | |
| empty string | × | |
| 0 | × | |
| 1, 3.14 | × | |
| array or dictionary | × | |
| empty array or dictionary | × | |
| Object | × |