Add Ruby snippet for implementing a singly linked list with node insertion and traversal

Author: ACR1209

snippets/ruby/data-structures/linked-list.md

@@ -0,0 +1,50 @@
+---
+title: Singly Linked List
+description: Implements a basic singly linked list with node insertion and traversal.
+author: ACR1209
+tags: ruby,data structures,linked list
+---
+
+```rb
+class Node
+  attr_accessor :data, :next
+
+  def initialize(data)
+      @data = data
+      @next = nil
+  end
+end
+
+class LinkedList
+  def initialize
+      @head = nil
+  end
+
+  def append(data)
+      new_node = Node.new(data)
+      if @head.nil?
+          @head = new_node
+      else
+          current = @head
+          current = current.next while current.next
+          current.next = new_node
+      end
+  end
+
+  def display
+      current = @head
+      while current
+          print "#{current.data} -> "
+          current = current.next
+      end
+      puts "nil"
+  end
+end
+
+# Usage:
+list = LinkedList.new
+list.append(1)
+list.append(2)
+list.append(3)
+list.display # Output: 1 -> 2 -> 3 -> nil
+```