Task Tracker Project - Part 2

Let's think this through for a second

Taking the Task and TaskTracker class structure from Part 1 as our base, this stage adds the app's core features. We'll use the each_with_index iterator to display the task list along with index numbers, and a ternary operator (? :) to show done status as [x] or [ ]. The complete_task and delete_task methods use if-else logic to check whether the task exists and handle the error case. By the end of this stage, the app won't just create tasks — it'll be a tool that tracks them.

Let's build it for real

Add a list_tasks method to the TaskTracker class — loop with @tasks.each_with_index do |task, i|, use a ternary to set status = task.done ? "[x]" : "[ ]", and puts "#{i + 1}. #{status} #{task.title}". Next, write the complete_task(index) method — grab the task at @tasks[index - 1], and if it exists set task.done = true, otherwise show "Task not found". For delete_task(index), use @tasks.delete_at(index - 1) to remove the task from the array, and show a different message depending on the result. Finally, wrap it all in a loop do...end block that reads user input with gets.chomp and uses case/when to route commands like "list", "add", "done", "delete", and "exit" to their respective methods.

• list_tasks method displays the task list with index numbers and status
• Both complete_task and delete_task methods handle the error case
• Commands are wired to their methods using case/when or a loop structure

Code Example

class TaskTracker
  # Part 1 ရဲ့ initialize, add_task, tasks ကို ဆက်သုံးပါမယ်

  def list_tasks
    @tasks.each_with_index do |task, i|
      status = task.done ? "[x]" : "[ ]"
      puts "#{i + 1}. #{status} #{task.title}"
    end
  end

  def complete_task(index)
    task = @tasks[index - 1]
    if task
      task.done = true
      puts "Completed: #{task.title}"
    else
      puts "Task not found"
    end
  end

  def delete_task(index)
    task = @tasks.delete_at(index - 1)
    task ? (puts "Deleted: #{task.title}") : (puts "Task not found")
  end
end

tracker = TaskTracker.new
loop do
  print "> "
  input = gets.chomp
  case input
  when "list"
    tracker.list_tasks
  when /^add /
    tracker.add_task(input.sub("add ", ""))
  when /^done /
    tracker.complete_task(input.sub("done ", "").to_i)
  when "exit"
    break
  end
end

In the terminal, the list command shows the task list along with its status, and the done/delete commands let you change a task's state.