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Showing content from https://shopify.github.io/liquid/tags/variable/ below:

Variable – Liquid template language

Variable tags create new Liquid variables.

Creates a new named variable.

Input

{% assign my_variable = false %}
{% if my_variable != true %}
  This statement is valid.
{% endif %}

Output

Wrap a value in quotations " to save it as a string variable.

Input

{% assign foo = "bar" %}
{{ foo }}

Output

Captures the string inside of the opening and closing tags and assigns it to a variable. Variables created using capture are stored as strings.

Input

{% capture my_variable %}I am being captured.{% endcapture %}
{{ my_variable }}

Output

Using capture, you can create complex strings using other variables created with assign.

Input

{% assign favorite_food = "pizza" %}
{% assign age = 35 %}

{% capture about_me %}
I am {{ age }} and my favorite food is {{ favorite_food }}.
{% endcapture %}

{{ about_me }}

Output

I am 35 and my favourite food is pizza.

Creates and outputs a new number variable with initial value 0. On subsequent calls, it increases its value by one and outputs the new value.

Input

{% increment my_counter %}
{% increment my_counter %}
{% increment my_counter %}

Output

Variables created using increment are independent from variables created using assign or capture.

In the example below, a variable named “var” is created using assign. The increment tag is then used several times on a variable with the same name. Note that the increment tag does not affect the value of “var” that was created using assign.

Input

{% assign var = 10 %}
{% increment var %}
{% increment var %}
{% increment var %}
{{ var }}

Output

Creates and outputs a new number variable with initial value -1. On subsequent calls, it decreases its value by one and outputs the new value.

Input

{% decrement variable %}
{% decrement variable %}
{% decrement variable %}

Output

Like increment, variables declared using decrement are independent from variables created using assign or capture.

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