Logtalk - Programming language

Logtalk is a programming language created in 1998 by Paulo Moura.

#535on PLDB

26Years Old

65Repos

Logtalk is an object-oriented logic programming language that extends and leverages the Prolog language with a feature set suitable for programming in the large. It provides support for encapsulation and data hiding, separation of concerns and enhanced code reuse. Logtalk uses standard Prolog syntax with the addition of a few operators and directives. Read more on Wikipedia...

Tags: programming language
There are at least 65 Logtalk repos on GitHub
Early development of Logtalk happened in https://github.com/LogtalkDotOrg
The Google BigQuery Public Dataset GitHub snapshot shows 50 users using Logtalk in 52 repos on GitHub
Explore Logtalk snippets on Rosetta Code
Logtalk on HOPL
Pygments supports syntax highlighting for Logtalk
GitHub supports syntax highlighting for Logtalk
logtalk.org was registered in 2002
See also: (7 related languages) Prolog, Smalltalk, Objective-C, SWI Prolog, Mercury, Oz, Visual Prolog
3 PLDB concepts link to Logtalk: Ace Editor, cloc, Pygments

Example from hello-world:

write('Hello World')

Example from Linguist:

% this is a Logtalk source file

:- object(hello_world).

	% the initialization/1 directive argument is automatically executed
	% when the object is loaded into memory:
	:- initialization((nl, write('********** Hello World! **********'), nl)).

:- end_object.

Example from Wikipedia:

?- my_first_object::p2.
ERROR: error(permission_error(access, private_predicate, p2), my_first_object::p2, user)

Language features

Feature	Supported	Example	Token
Binary Literals	✓
Hexadecimals	✓
Octals	✓
Strings	✓	'Hello world'	'
Print() Debugging	✓		write
Multiple Inheritance	✓
Comments	✓
Semantic Indentation	X