How to resolve the algorithm Empty string step by step in the Common Lisp programming language

Published on 12 May 2024 09:40 PM
#Common lisp

How to resolve the algorithm Empty string step by step in the Common Lisp programming language

Table of Contents

Problem Statement

Languages may have features for dealing specifically with empty strings (those containing no characters).

Let's start with the solution:

Step by Step solution about How to resolve the algorithm Empty string step by step in the Common Lisp programming language

Source code in the common programming language

(defparameter *s* "") ;; Binds dynamic variable *S* to the empty string ""
(let ((s "")) ;; Binds the lexical variable S to the empty string ""
  (= (length s) 0) ;; Check if the string is empty
  (> (length s) 0) ;; Check if length of string is over 0 (that is: non-empty)

  ;; (length s) returns zero for any empty sequence. You're better off using type checking:
  (typep s '(string 0)) ;; only returns true on empty string
  (typep s '(and string
                 (not (string 0)))))  ;; only returns true on string that is not empty

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