Conditional tags let you execute code only if a certain condition is met. This allows for creating dynamic templates that respond to different states and data.

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if

Executes a block of code only if a condition is true. 
{% if condition %}
  // code to execute if condition is true
{% endif %}
​
condition
boolean
The condition to evaluate.
{% if user.is_logged_in %}
  Welcome back, {{ user.name }}!
{% endif %}

Welcome back, John!

​
else

Provides an alternative block of code to execute when an if condition is false. 
{% if condition %}
  // code to execute if condition is true
{% else %}
  // code to execute if condition is false
{% endif %}

{% if user.is_logged_in %}
  Welcome back, {{ user.name }}!
{% else %}
  Please log in.
{% endif %}

Please log in.

​
unless

The opposite of if. Executes a block of code only if a condition is false. 
{% unless condition %}
  // code to execute if condition is false
{% endunless %}
​
condition
boolean
The condition to evaluate.
{% unless user.is_logged_in %}
  Please log in to continue.
{% endunless %}

Please log in to continue.

​
case

Executes one of many blocks of code, depending on the value of a variable. 
{% case variable %}
  {% when value1 %}
    // code to execute if variable equals value1
  {% when value2 %}
    // code to execute if variable equals value2
  {% else %}
    // code to execute if variable doesn't match any values
{% endcase %}
​
variable
any
The variable to evaluate.
{% assign level = "advanced" %}

{% case level %}
  {% when "beginner" %}
    Start with the basics
  {% when "intermediate" %}
    Build on your knowledge
  {% when "advanced" %}
    Tackle complex concepts
  {% else %}
    Select a level
{% endcase %}

Tackle complex concepts