Jekyll: check if file exists

So I needed to display a file if it exists. A quick search yielded two options:

1. Some old, weird plugins on Github: 1, 2.
2. Stackoverflow’s for loop of horror:

   {% for static_file in site.static_files %}
      {% if static_file.path == '/favicon.ico' %}
          {% assign favicon = true %}
      {% endif %}
   {% endfor %}
   

Both not very attractive, so I dived into docs to see if there’s something better. Here’s the result:

{% assign file = site.static_files | where: "path", jpg_path | first %}
{% if file %}<img src="{{ jpg_path }}">{% endif %}

No idea if it’s faster than the for loop, but at least it’s not as ugly.