How to resolve the algorithm Comma quibbling step by step in the EchoLisp programming language

Published on 12 May 2024 09:40 PM
#Echolisp

How to resolve the algorithm Comma quibbling step by step in the EchoLisp programming language

Table of Contents

Problem Statement

Comma quibbling is a task originally set by Eric Lippert in his blog.

Write a function to generate a string output which is the concatenation of input words from a list/sequence where:

Test your function with the following series of inputs showing your output here on this page:

Note: Assume words are non-empty strings of uppercase characters for this task.

Let's start with the solution:

Step by Step solution about How to resolve the algorithm Comma quibbling step by step in the EchoLisp programming language

Source code in the echolisp programming language

(lib 'match)

(define (quibble words)
    (match words
         [ null "{}"]
         [ (a)  (format "{ %a }" a)]
         [ (a b) (format "{ %a and %a }" a b)]
         [( a ... b c) (format "{ %a %a and %a }" (for/string ([w a]) (string-append w ", "))  b c)]
         [else 'bad-input]))
 

;; output

 (for ([t '(() ("ABC") ("ABC" "DEF") ("ABC" "DEF" "G" "H"))])
    (writeln t '----> (quibble t)))

null     ---->     "{}"    
("ABC")     ---->     "{ ABC }"    
("ABC" "DEF")     ---->     "{ ABC and DEF }"    
("ABC" "DEF" "G" "H")     ---->     "{ ABC, DEF, G and H }"

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