Optimizing Workflow with Loop Controls and Data Management

[maahee]

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CASE 1
(setq ss (ssadd))
(if (not (ssmemb n ss))
  (ssadd n ss)
;code
);if


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CASE 2

(setq flag T)

  (while flag
    (setq obj (ssget "_:S"))
    (cond
      (obj
       ;CODE
      )					;ar
      (t
       (princ "\nNo selection made.")
       (initget "X")
       (setq
	 bm (strcase
	      (getstring
		"\nEnter 'X' to exit or press Enter to continue [X]: "
	      )
	    )
       )
       (if (= bm
	      "X"
	   )
	 (setq flag nil)		; Exit the loop if user types 'x'
	 (princ "\nInvalid input. Please try again.")
       )				;if
      )
    )
    );WHILE
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CASE 1: If the dataset is large, it will slow down the process. alternatives or tricks.

CASE 2: Press the Enter key once to continue the loop, and press it twice to exit.

or 

Only the letter "x" and empty inputs are acceptable.