# clear

Explicitly removes variables from memory to help garbage collection. Use this tag to free up memory after processing large arrays or objects that are no longer needed.

```liquid
{% json products %}
  [
    { "id": 1, "title": "Product 1" },
    { "id": 2, "title": "Product 2" },
    { "id": 3, "title": "Product 3" }
  ]
{% endjson %}

{% assign product_titles = products | map: "title" %}

{% comment %} Process the data... {% endcomment %}
{% log product_titles %}

{% comment %} Clear variables when no longer needed {% endcomment %}
{% clear products, product_titles %}

{% comment %} Variables are now removed from memory {% endcomment %}
{% log products %}
```

Results in following output:

```
["Product 1", "Product 2", "Product 3"]
null
```

#### Syntax

```liquid
{% clear variable_name %}
{% clear var1, var2, var3 %}
```

| Parameter         | Description                             |
| ----------------- | --------------------------------------- |
| `variable_name`   | Name of the variable to clear           |
| `var1, var2, ...` | Multiple comma-separated variable names |

#### Use Cases

**After processing large CSV files:**

```liquid
{% assign all_rows = file_content | split: "\n" %}
{% assign parsed_data = all_rows | parse_csv %}

{% comment %} Process parsed_data... {% endcomment %}

{% clear file_content, all_rows %}
```

**After GraphQL pagination:**

```liquid
{% assign all_products = "[]" | parse %}

{% for page in (1..10) %}
  {% graphql query:products_query as page_result %}
  {% assign all_products = all_products | concat: page_result.products.edges %}
  {% clear page_result %}
{% endfor %}
```

**End of script cleanup:**

```liquid
{% comment %} Clear all large variables before script ends {% endcomment %}
{% clear ALL_PARSED_PRODUCT, ALL_EXIST_SKU, IMPORT_FILES, LOCAL_FILES %}
```

#### Notes

* Removes variables from all scopes (local and global)
* Sets variable to `null` before deletion to assist garbage collection
* No error is thrown if variable doesn't exist
* Useful for long-running scripts that process large datasets