This website is built using Jekyll, a static website builder written in Ruby.

There’s a lot of static website builders out there. I picked Jekyll because it’s easy to use and extend (in Ruby), and is supported by both GitHub Pages and Netlify, the latter of which is used to host this website.

I recently added an Archive page to show a list of posts grouped by year. There’s a number of ways you can do this, and I’ve seen many hacky implementations on Stack Overflow. Thankfully it’s actually pretty easy.

Jekyll 3.4.0 introduced the group_by_exp Liquid Filter, allowing us to group our posts according to the expression we pass as an argument. This argument is itself a Liquid expression, allowing us to re-use Liquid filters.

Here’s how to group our posts by year:

{% assign grouped_posts = site.posts | group_by_exp: "post", "post.date | date: '%Y'" %}
{% for year in grouped_posts %}
  <strong>{{ year.name }}</strong>
  <ul>
    {% for post in year.items %}
      <li>{{ post.title }}</li>
    {% endfor %}
  </ul>
{% endfor %}

We can even repeat our grouping inside the loop to include per-month subheadings:

{% assign grouped_by_year = site.posts | group_by_exp: "post", "post.date | date: '%Y'" %}
{% for year in grouped_by_year %}
  <strong>{{ year.name }}</strong>
  {% assign grouped_by_month = year.items | group_by_exp: "post", "post.date | date: '%B'" %}
  {% for month in grouped_by_month %}
    <strong>{{ month.name }}</strong>
    <ul>
      {% for post in month.items %}
        <li>{{ post.title }}</li>
      {% endfor %}
    </ul>
  {% endfor %}
{% endfor %}

Whilst I’m not a huge fan of the Liquid syntax, Jekyll includes a number of really convenient filters. It’s worth checking out their list when creating these sorts of pages.