liquid/basics/truthy-and-falsy.md

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Truthy and Falsy

In programming, anything that returns true in a conditional is called truthy. Anything that returns false in a conditional is called falsy. All object types can be described as either truthy or falsy.

Truthy

All values in Liquid are truthy except nil and false.

In the example below, the text "Tobi" is not a boolean, but it is truthy in a conditional:

{% highlight liquid %}{% raw %} {% assign tobi = 'Tobi' %}

{% if tobi == true %} This condition will always be true. {% endif %} {% endraw %}{% endhighlight %}

Strings, even when empty, are truthy. The example below will result in empty HTML tags if settings.fp_heading is empty:

{% highlight html %}{% raw %} {% if settings.fp_heading %}

{{ settings.fp_heading }}

{% endif %} {% endraw %}{% endhighlight %}

{% highlight html %}{% raw %}

{% endraw %}{% endhighlight %}

EmptyDrops are also truthy. In the example below, if settings.page is an empty string or set to a hidden or deleted object, you will end up with an EmptyDrop. The result is an empty div:

{% highlight html %}{% raw %} {% if pages[settings.page] %}

{{ pages[settings.page].content }}

{% endif %} {% endraw %}{% endhighlight %}

{% highlight html %}{% raw %}

{% endraw %}{% endhighlight %}

Falsy

The falsy values in Liquid are nil and false.

Summary

The table below summarizes what is truthy or falsy in Liquid.

	truthy	falsy
true	•
false		•
nil		•
string	•
empty string	•
0	•
integer	•
float	•
array	•
empty array	•
page	•
EmptyDrop	•