Eleventy: How do you list all posts grouped by year?

[logicman]

I am using the Eleventy-base-blog and on the archive page it lists all the posts in chronological order.
This is the folder structure. All 2010 .md files are in the /posts/2010/ folder. And so on...

/posts/2010/
/posts/2011/
/posts/2012/
.....

The archived page works perfectly however, I want to group all 2010 posts together under the heading 2010. Then, all 2011 posts under 2011.....any idea how to achieve this or point me in the right direction?

Thanks!

[logicman]

It works and I think I got this one with some nunjucks code :)
So, in my postlist.njk I wrote this:

<ol reversed>
{% set currentYear = "" %}
{% for post in postslist | reverse %}
{% if showYear %}
      {% set postYear = post.date.getFullYear() %}
      {% if currentYear != postYear %}
      {% set currentYear = postYear %}
      <h3>{{ postYear }}</h3>
      {% endif %}
{% endif %}
  <li class=" mb-10 list-none">
    <h2><a href="{{ post.url | url }}">{% if post.data.title %}{{ post.data.title }}{% else %}<code>{{ post.url }}</code>{% endif %}</a></h2>
  </li>
{% endfor %}
</ol>

And, in the archive.njk file I have this:

<h1>Blog</h1>
{% set showYear = true %}
{% set postslist = collections.posts %}
{% include "postslist.njk" %}

The output is:

2012
Blog post 1
Blog post 2

2011
Blog post 1
Blog post 2

2010
Blog post 1
Blog post 2

This way, my index.njk which also lists the latest 10 posts won't show the date as I don't have the showYear.

Is this the best way to achieve this?

Thanks!

[davidrhoden]

I don't know if it's the best way, but it solved my issue nicely. What's the correct way to get data to a layout so I can do a "groupby" on it? #15