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Adam Hollett
2015-10-15 17:01:53 -04:00
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_basics/operators.md
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title: Operators
---
Liquid has access to all of the logical and comparison operators.
Liquid includes many logical and comparison operators.
### Basic Operators
@@ -17,7 +17,7 @@ Liquid has access to all of the logical and comparison operators.
<td>does not equal</td>
</tr>
<tr>
<td><pre>></pre></td>
<td><pre>&gt;</pre></td>
<td>greater than</td>
</tr>
<tr>
@@ -25,9 +25,8 @@ Liquid has access to all of the logical and comparison operators.
<td>less than</td>
</tr>
<tr>
<td><pre>>=</pre></td>
<td>greater than or equal to</td>
<td><pre>&gt;=</pre></td>
<td>greater than or equal to</td>
</tr>
<tr>
<td><pre>&lt;=</pre></td>
@@ -35,84 +34,51 @@ Liquid has access to all of the logical and comparison operators.
</tr>
<tr>
<td><pre>or</pre></td>
<td>condition A <strong>or</strong> condition B</td>
<td>logical or</td>
</tr>
<tr>
<td><pre>and</pre></td>
<td>condition A <strong>and</strong> condition B</td>
<td>logical and</td>
</tr>
</tbody>
</tbody>
</table>
**Examples:**
For example:
<div>
{% highlight html %}{% raw %}
{% highlight liquid %}{% raw %}
{% if product.title == "Awesome Shoes" %}
These shoes are awesome!
These shoes are awesome!
{% endif %}
{% endraw %}{% endhighlight %}
</div>
Operators can be chained together.
You can use multiple operators in a tag:
<div>
{% highlight html %}{% raw %}
{% highlight liquid %}{% raw %}
{% if product.type == "Shirt" or product.type == "Shoes" %}
This is a shirt or a shoe.
This is a shirt or a pair of shoes.
{% endif %}
{% endraw %}{% endhighlight %}
</div>
### contains
`contains` checks for the presence of a substring inside a string.
### Contains operator
<code>contains</code> checks for the presence of a substring inside a string.
{% highlight html %}{% raw %}
{% highlight liquid %}{% raw %}
{% if product.title contains 'Pack' %}
This product's title contains the word Pack.
{% endif %}
{% endraw %}{% endhighlight %}
`contains` can also check for the presence of a string in an array of strings.
<code>contains</code> can also check for the presence of a string in an array of strings.
{% highlight html %}{% raw %}
{% highlight liquid %}{% raw %}
{% if product.tags contains 'Hello' %}
This product has been tagged with 'Hello'.
{% endif %}
{% endraw %}{% endhighlight %}
You **cannot** check for the presence of an object in an array of objects using contains. This will not work:
{% highlight html %}{% raw %}
{% if product.collections contains 'Sale' %}
One of the collections this product belongs to is the Sale collection.
{% endif %}
{% endraw %}{% endhighlight %}
This will work:
{% highlight html %}{% raw %}
{% assign in_sale_collection = false %}
{% for collection in product.collections %}
{% if in_sale_collection == false and collection.title == 'Sale' %}
{% assign in_sale_collection = true %}
{% endif %}
{% endfor %}
{% if in_sale_collection %}
One of the collections this product belongs to is the Sale collection.
{% endif %}
{% endraw %}{% endhighlight %}
`contains` is can only search strings. You cannot use it to check for an object in an array of objects.