How to resolve the algorithm String prepend step by step in the Prolog programming language

Published on 12 May 2024 09:40 PM
#Prolog

How to resolve the algorithm String prepend step by step in the Prolog programming language

Table of Contents

Problem Statement

Create a string variable equal to any text value. Prepend the string variable with another string literal. If your language supports any idiomatic ways to do this without referring to the variable twice in one expression, include such solutions.

To illustrate the operation, show the content of the variable.

Let's start with the solution:

Step by Step solution about How to resolve the algorithm String prepend step by step in the Prolog programming language

Source code in the prolog programming language

:- op(200, xfx, user:(=+)).

%% +Prepend =+ +Chars
%
%    Will destructively update Chars
%    So that Chars = Prepend prefixed to Chars.
%    eazar001 in ##prolog helped refine this approach.

[X|Xs] =+ Chars :-
  append(Xs, Chars, Rest),
  nb_setarg(2, Chars, Rest),
  nb_setarg(1, Chars, X).


?- Str = `World!`, `Hello, ` =+ Str.
Str = "Hello, World!".

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