Variable tags - Biến số

Variable Tags are used to create new Liquid variables.

In this article

• assign
• capture
• increment
• decrement

assign

Creates a new variable.

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

Output
    This statement is valid.

Use quotations ("") to save the variable as a string.

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

Output
bar

capture

Captures the string inside of the opening and closing tags and assigns it to a variable. Variables created through {% capture %} are strings.

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

Output
I am being captured.

increment

Creates a new number variable, and increases its value by one every time it is called. The initial value is 0.

Input
{% increment variable %}
{% increment variable %}
{% increment variable %}

Output
0
1
2

Variables created through the increment tag are independent from variables created through assign or capture.

In the example below, a variable named "var" is created through assign. The increment tag is then used several times on a variable with the same name. However, note that the increment tag does not affect the value of "var" that was created through assign.

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

Output
0
1
2
10

decrement

Creates a new number variable, and decreases its value by one every time it is called. The initial value is -1.

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

Output
-1
-2
-3

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