made a new section for programming posts

_config.yml

@@ -29,6 +29,8 @@ theme: minima
 collections:
     homelab:
       output: true
+    programming:
+        output: true
 
 # Exclude from processing.
 # The following items will not be processed, by default. Create a custom list

_layouts/programming.html

@@ -1,6 +1,6 @@
 ---
 layout: default
 ---
-<div id="post">
+<div id="programming">
 {{ content }}
 </div>

_programming/2019-02-05-ruby2.6+-array#difference.markdown

@@ -0,0 +1,61 @@
+---
+layout: programming
+title:  "Ruby 2.6+ Array#Difference"
+date:  2019-02-05 
+categories: programming
+---
+
+# Array#Difference - [Array#Difference](https://github.com/ruby/ruby/blob/trunk/array.c#L4450-L4563)
+I wanted to do a quick post on a new method added to ruby Array class in version 2.6. I just learned about this over the past weekend. 
+This will quickly grow to be a favorite of mine.
+
+A method to check differences in values between two arrays.
+
+#### Make arrays abc and abcdef
+
+{% highlight ruby %}
+[1] pry(main)> abc = ['a','b','c'] 
+=> ["a", "b", "c"]
+
+[2] pry(main)> abcdef = 'a', 'b', 'c', 'd', 'e', 'f'
+=> ["a", "b", "c", "d", "e", "f"]
+{% endhighlight %}
+
+
+<hr>
+
+
+#### ruby 2.5
+In versions prior, I would make a .difference method in my .pryrc file and that
+will be loaded at runtime when I run my console. You can also monkey patch it
+live in a pry console. Found this via
+[stackedoverflow](https://stackoverflow.com/questions/8639857/rails-3-how-to-get-the-difference-between-two-arrays)
+post. Here is how I would add it in a running pry session: 
+
+{% highlight ruby %}
+[17] pry(main)> class Array
+[17] pry(main)*   def difference(a)
+[17] pry(main)*     self - a | a - self
+[17] pry(main)*   end  
+[17] pry(main)* end  
+=> :difference
+
+[26] pry(main)> abcdef.difference(abc)
+=> ["d", "e", "f"]
+
+{% endhighlight %}
+
+
+<hr>
+
+
+#### ruby 2.6
+But now in ruby 2.6+, you can just use the .difference method. It is built into
+the class now.
+
+{% highlight ruby %}
+[3] pry(main)> abcdef.difference(abc)
+=> ["d", "e", "f"]
+{% endhighlight %}
+
+so nice, so easy!

css/screen.css

@@ -51,12 +51,19 @@ table {
   font: 100%;
 }
 
+hr { 
+    margin-top: 10px;
+    margin-bottom: 10px;
+}
+
+
 /*****************************************************************************/
 /*
 /* Home
 /*
 /*****************************************************************************/
 
+# posts 
 ul.posts {
   list-style-type: none;
   margin-bottom: 2em;
@@ -72,6 +79,7 @@ ul.posts {
     font-size: 80%;
   }
 
+# homelab
 ul.homelab {
   list-style-type: none;
   margin-bottom: 2em;
@@ -87,6 +95,23 @@ ul.homelab {
     font-size: 80%;
   }
 
+
+# programming
+ul.programming {
+  list-style-type: none;
+  margin-bottom: 2em;
+}
+
+  ul.programming li {
+    line-height: 1.75em;
+  }
+
+  ul.programming span {
+    color: #aaa;
+    font-family: Monaco, "Courier New", monospace;
+    font-size: 80%;
+  }
+
 /*****************************************************************************/
 /*
 /* Site

index.html

@@ -10,9 +10,17 @@ title: brendan mcdevitt
       <li><span>{{ post.date | date_to_string }}</span> &raquo; <a href="{{ post.url }}">{{ post.title }}</a></li>
     {% endfor %}
   </ul>
+
   <h1>Homelab Posts</h1>
   <ul class="homelab">
     {% for post in site.homelab %}
       <li><span>{{ post.date | date_to_string }}</span> &raquo; <a href="{{ post.url }}">{{ post.title }}</a></li>
     {% endfor %}
   </ul>
+
+  <h1>Programming</h1>
+  <ul class="programming">
+    {% for post in site.programming %}
+      <li><span>{{ post.date | date_to_string }}</span> &raquo; <a href="{{ post.url }}"> {{post.title }}</a></li>
+    {% endfor %}
+  </ul>