Step by Step solution about How to resolve the algorithm Singly-linked list/Element insertion step by step in the Ruby programming language

The provided Ruby code defines a custom linked list class and a method insert_after for inserting a new value after a specified existing value in the list. Here's a detailed explanation:

1. ListNode Class:

   • This is a custom linked list node class that represents individual nodes in the linked list.
   • It has a value attribute to store the data in the node and a succ attribute to point to the next node in the list.

2. insert_after Method:

   • This method takes two parameters:
     • search_value: The value of the node after which to insert the new value.
     • new_value: The new value to be inserted.
   • It performs a recursive search through the linked list to find the node with the specified search_value.
   • If the search_value is found, it inserts the new node with the new_value after the node with the search_value.
   • If the search_value is not found, it raises an error indicating that the value was not found in the list.

3. Creating the Linked List:

   • The code creates a linked list by initializing two ListNode objects:
     • The first node has a value of :a.
     • The second node has a value of :b and is linked to the first node via the succ attribute.

4. Inserting a New Value:

   • The insert_after method is then called on the first node, passing in the :a value and the new value :c to be inserted.
   • Since the :a value is found in the linked list, a new node with the value :c is inserted after the node with the :a value.

In summary, this code defines a custom singly linked list in Ruby and provides a method to insert a new value after a specified existing value in the list. The code demonstrates the insertion operation by creating a linked list and inserting a new value :c after the node with the value :a.

class ListNode
  def insert_after(search_value, new_value)
    if search_value == value
      self.succ = self.class.new(new_value, succ)
    elsif self.succ.nil?
      raise StandardError, "value #{search_value} not found in list"
    else
      self.succ.insert_after(search_value, new_value)
    end
  end
end

list = ListNode.new(:a, ListNode.new(:b))
list.insert_after(:a, :c)