CODEWITHSUNDEEP
prolog
Shron
Shron

Reputation: 11

Prolog: Reverse function of string_to_list

I know the Prolog-builtin "string_to_list". Now i need to reverse its functionality.

?- string_to_list('a*1+2', L).
L = [97, 42, 49, 43, 50].

How can i reverse this? Is there a builtin function? Anything that does what "desiredfunction" does, would be a great help.

?- desiredfunction([97, 42, 49, 43, 50], R).
R = 'a*1+2'.

Thank you.

Upvotes: 1

Views: 345

Answers (1)

Sergey Kalinichenko
Sergey Kalinichenko

Reputation: 726499

string_to_list/2 is deprecated in favor of string_codes/2.

The predicate is bidirectional, meaning that you can plug in a list, and get a string back on the other side.

string_codes(R, [97, 42, 49, 43, 50])

Better yet, use atom_codes/2, which is also bidirectional, and is more widely supported among Prolog implementations:

atom_codes(R, [97, 42, 49, 43, 50])

This produces

a*1+2

Upvotes: 4

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