For

v1.9.1

Iteration tags run blocks of code repeatedly.

Basic Usage

for…in

Repeatedly executes a block of code. For a full list of attributes available within a for loop, see forloop.

Input

{% for product in collection.products %}
  {{ product.title }}
{% endfor %}

Output

hat shirt pants

For loops can iterate over arrays, hashes, and ranges of integers.

When iterating a hash, item[0] contains the key, and item[1] contains the value:

Input

{% for item in hash %}
  * {{ item[0] }}: {{ item[1] }}
{% endfor %}

Output

* key1: value1
* key2: value2

else

Specifies a fallback case for a for loop which will run if the loop has zero length.

Input

{% for product in collection.products %}
  {{ product.title }}
{% else %}
  The collection is empty.
{% endfor %}

Output

The collection is empty.

break

Causes the loop to stop iterating when it encounters the break tag.

Input

{% for i in (1..5) %}
  {% if i == 4 %}
    {% break %}
  {% else %}
    {{ i }}
  {% endif %}
{% endfor %}

Output

1 2 3

continue

Causes the loop to skip the current iteration when it encounters the continue tag.

Input

{% for i in (1..5) %}
  {% if i == 4 %}
    {% continue %}
  {% else %}
    {{ i }}
  {% endif %}
{% endfor %}

Output

1 2 3   5

forloop

There’s a forloop object available inside for loops. It’s used to indicate the current state of for loop.

The forloop.first, forloop.last and forloop.length property:

Input

{% for i in (1..5) %}
  {%- if forloop.first == true -%} First
  {%- elsif forloop.last == true -%} Last
  {%- else -%} {{ forloop.length }}
  {%- endif %}
{% endfor -%}

Output

First
5
5
5
Last

The forloop.index, forloop.index0, forloop.rindex and forloop.rindex0 property:

Input

index index0 rindex rindex0
{% for i in (1..5) %}
  {{- forloop.index }}     {{ forloop.index0 }}      {{ forloop.rindex }}      {{ forloop.rindex0 }}
{% endfor -%}

Output

index index0 rindex rindex0
1     0      5      4
2     1      4      3
3     2      3      2
4     3      2      1
5     4      1      0

Parameters

limit

Limits the loop to the specified number of iterations.

Input

<!-- if array = [1,2,3,4,5,6] -->
{% for item in array limit:2 %}
  {{ item }}
{% endfor %}

Output

1 2

offset

Begins the loop at the specified index.

Input

<!-- if array = [1,2,3,4,5,6] -->
{% for item in array offset:2 %}
  {{ item }}
{% endfor %}

Output

3 4 5 6

range

Defines a range of numbers to loop through. The range can be defined by both literal and variable numbers.

Input

{% for i in (3..5) %}
  {{ i }}
{% endfor %}

{% assign num = 4 %}
{% for i in (1..num) %}
  {{ i }}
{% endfor %}

Output

3 4 5
1 2 3 4

reversed

Reverses the order of the loop. Note that this flag’s spelling is different from the filter reverse.

Input

<!-- if array = [1,2,3,4,5,6] -->
{% for item in array reversed %}
  {{ item }}
{% endfor %}

Output

6 5 4 3 2 1

When used with additional parameters, order is important. Leading with reversed reverses the order of the loop before executing the other parameters.

Input

{% for i in (1..8) reversed limit: 4 %}
  {{ i }}
{% endfor %}

Output

8 7 6 5

Input

{% for i in (1..8) limit: 4 reversed %}
  {{ i }}
{% endfor %}

Output

4 3 2 1