Is that possible to append array in jekyll
<p>Is that possible to append array in jekyll?</p>

<p>like, append <code>{{ site.tweets }}</code> to <code>{{ site.posts }}</code>?</p>

<h2>so here are the data:</h2>

<pre><code>- name: "日本語"
  prog_num: 10
  prog: "10%"
  img: ""
  type: "language"
- name: "中文"
  prog_num: 100
  prog: "100%"
  img: ""
  type: "language"
</code></pre>

<hr>

<h2><code>concat</code> doesn't work:</h2>

<pre><code>{% assign hl = site.data.skills_human_languages %}
{% assign pl = site.data.skills_programming_languages %}
{% assign fw = site.data.skills_frameworks %}
{% assign dt = site.data.skills_design_tools %}
{% assign all_skills = (hl | concat: pl | concat: fw | concat: dt) %}
</code></pre>

<hr>

<p>I'm using <code>jekyll b</code> command with version of 3.3.1</p>