Liquid - Liquid Types

String

Declare a string by wrapping a variable’s value in single or double quotes:


{% assign my_string = "Hello World!" %}

Number

Numbers include floats and integers:


{% assign my_int = 25 %}
{% assign my_float = 39.756 %}

Boolean

Booleans are either true or false. No quotations are necessary when declaring a boolean:


{% assign foo = true %}
{% assign bar = false %}

Nil

Nil is a special empty value that is returned when Liquid code has no results. It is not a string with the characters “nil”.

Nil is treated as false in the conditions of if blocks and other Liquid tags that check the truthfulness of a statement.

In the following example, if the user does not exist (that is, user returns nil), Liquid will not print the greeting:


{% if user %}
  Hello {{ user.name }}!
{% endif %}

Tags or outputs that return nil will not print anything to the page.

Input


The current user is {{ user.name }}

Output

The current user is

Array

Arrays hold lists of variables of any type.

Accessing items in arrays

To access all the items in an array, you can loop through each item in the array using an iteration tag.

Input


{% comment %} if site.users = "Tobi", "Laura", "Tetsuro", "Adam" {% endcomment %}
{% for user in site.users %}
  {{ user }}
{% endfor %}

Output

Tobi Laura Tetsuro Adam

Accessing specific items in arrays

You can use square bracket [ ] notation to access a specific item in an array. Array indexing starts at zero.

Input


{% comment %} if site.users = "Tobi", "Laura", "Tetsuro", "Adam" {% endcomment %}
{{ site.users[0] }}
{{ site.users[1] }}
{{ site.users[3] }}

Output

Tobi
Laura
Adam

Initializing arrays

You cannot initialize arrays using only Liquid.

You can, however, use the split filter to break a string into an array of substrings.


{% assign arr = '1,2,3,4,5' | split: ',' %}
{{ arr }} => [1, 2, 3, 4, 5]

Truthy and falsy values

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 string “Tobi” is not a boolean, but it is truthy in a conditional:


{% assign tobi = "Tobi" %}

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

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

Input


{% if settings.fp_heading %}
  <h1>{{ settings.fp_heading }}</h1>
{% endif %}

Output

<h1></h1>

Falsy

The falsy values in Liquid are nil and false.

Truthiness summary table

Liquid expressions are tested for "truthiness" in a Ruby-like way:

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

Note

This topic is a compilation of knowledge found at: Shopify Themes, Liquid Documentation, Liquid Gem Documentation, and Liquid for Designers.

Questions?

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