[Lua][Question]

Selection = 1 -- The variable that holds the current selection that we're on.
bRunning = true -- The variable that holds whether or not the program is currently running.
function DrawSelections() -- Draws the selections and signals if they're selected or not.
if Selection == 1 then -- If the selection is on the first option.
  print( "[Option1]" ) -- Draw the selection with brackets around it as to signal that it is selected.
else -- If the selection is not on the first option.
  print( " Option1 " ) -- Draw the selection without braackets around it as to signal that it is not selected.
end

if Selection == 2 then -- If the selection is on the second option.
  print( "[Option2]" ) -- Draw the selection with brackets around it as to signal that it is selected.
else -- If the selection is not on the second option.
  print( " Option2 " ) -- Draw the selection without brackets around it as to signal that it is not selected.
end

if Selection == 3 then -- If the selection is on the last option.
  print( "[Exit]" ) -- Draw the selection with brackets around it as to signal that it is selected.
else -- If the selection is not selected.
  print( " Exit " ) -- Draw the selection without brackets around it as to signal that it is not selected.
end
end
function Clear() -- Clears the screen.
term.clear() -- Clear all of the current text from the screen.
term.setCursorPos( 1, 1 ) -- Set the cursor at the upper hand left corner at (1, 1).
end
function HandleKeyPress( Key ) -- Takes a key number and moves the selection accordingly.
if Key == 200 then -- If the up key is pressed.
  if Selection > 1 then -- If the selection is greater than 1; if there are more selections before the current one.
   Selection = Selection - 1 -- Move the selection up one on the menu.
  end
elseif Key == 208 then -- If the down key is pressed.
  if Selection < 3 then -- If the selectoin is less than 3; if there are more selections after the current one.
   Selection = Selection + 1 -- Move the selection down one on the menu.
  end
elseif Key == 28 then -- If the enter key is pressed.
  if Selection == 1 then -- If the selection is on the first option and the enter key is pressed.
   term.setCursorPos( 5, 16 ) -- Place the cursor at x = 5, y = 16 (5, 16)
   print( "Option1 pressed!" ) -- Print the text within the parenthesis.
   sleep( 2 ) -- Wait 2 seconds before executing the next instruction.
  elseif Selection == 2 then -- If the selection is on the second option and the enter key is pressed.
   term.setCursorPos( 5, 16 ) -- Place the cursor at x = 5, y = 16 (5, 16)
   print( "Option2 pressed!" ) -- Print the text within the parenthesis.
   sleep( 2 ) -- Wait 2 seconds before executing the next instruction.
  elseif Selection == 3 then -- If the selectoin is on the third or 'Exit' option and the enter key is pressed.
   -- Reset the screen to look like the computer just turned on.
   Clear() -- Clear the screen.
   print( os.version() ) -- Print the OS version.
  
   bRunning = false -- Terminate the main program loop.
  end
end
end
while bRunning do -- While the bRunning variable holds a value of true, or if is not boolean, holds a value other than nil.
Clear() -- Clear the screen so we may update it.
DrawSelections() -- Redraw the current state of the menu.

local event, key = os.pullEvent( "key" ) -- Wait for any key press.
HandleKeyPress( key ) -- Handle the key pressed by passing the key value from the event to the HandleKeyPress function.
end