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Integrating Prolog with C# [closed]
(7 answers)
Closed 8 years ago.
I have a prolog code for searching a book. It is a simple game. I want to make interfaces with C#. But i don't know how to connect prolog into c#. Please help me. How to conncet prolog with C#.
Besides the answers mentioned on the comment link there is also a SWI Prolog has a C# Interface. You can see it here.
Here is an example provided by the aforementioned link:
PlQuery q = new PlQuery("member(A, [a,b,c])");
foreach (PlTermV s in q.Solutions)
Console.WriteLine(s[0].ToString());
There is a full documentation.
Related
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What does map(&:name) mean in Ruby?
(17 answers)
Closed 12 months ago.
This is from a solution I saw at a competitive programming site:
gets.split.map &:to_i
The &:to_i phrase seems to be equivalent to {|s| s.to_i}, but I can't find anything about that syntax at ruby-doc.org, or a match for "&:" [ruby] here. (I don't know what to call it for an English language search, either.)
If it matters, that site is using Ruby 3.0.1.
It's an example of Symbol#to_proc - see https://www.brianstorti.com/understanding-ruby-idiom-map-with-symbol/ for a more detailed explanation, or the ruby API documentation
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How does CoffeeScript's existential operator work?
(1 answer)
Closed 9 years ago.
I see all sorts of questions about the existential operator on SO, but none of them ask the fundamental question of "what is it for" and "how do you use it?" so I thought I'd ask this here.
The answer here would probably suffice as an answer to this question, but the problem is the question title doesn't suggest that. As a result, it's very hard to find this question by a google search. So, my intention here is to make it easier to learn what this operator does from a google search.
BTW, I am aware of the section in the The Little Book on CoffeeScript titled "Aliases & the Existential Operator", but for some reason I don't like its explanation. It doesn't make me feel like "I get it".
The existential operator provides a more concise and expressive way to handle null and undefined properties.
Instead of
if (user && user.url && user.url.indexOf('foo'))
you can do
if user?.url?.indexOf 'foo'
Instead of
if (baker.bakeBread) { baker.bakeBread()}
you can do coffeescript
baker.bakeBread?()
This question already has answers here:
Closed 11 years ago.
Possible Duplicates:
Double colons rails
What does :: do?
I was reading a manual on Rails and came across this snippet:
match 'rocketeer.js' => ::TestRoutingMapper::RocketeerApp
I'd never seen the :: syntax at the head of a class name before. I'm wondering what is the significance of writing it this way.
See my answer to What does :: do?
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Closed 7 years ago.
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I'd like to write a code beautifier and i thought of using Ruby to do it. Could someone show me a place to get started? I've seen a lot of code beautifiers online but I've never come across any tutorials on how to write one. Is this a very challenging task for someone who's never undertaken any projects such as writing a compiler, parser, etc. before?
(Is there another langauge which would be more well suited for this kind of task, excluding C/C++?)
Python has an interesting feature - it exposes its own parser to scripts. There are examples that use the AST - abstract syntax tree - and do the pretty printing.
I'm not aware that Ruby exposes its own parser to its scripts in such a way, but there are parsers for Ruby written in Ruby here.
Well... I think the initial steps are what you'd do for any project.
Write a list of requirements.
Describe a user interface to your program, that you like and won't prevent you meeting those requirements.
Now you can write down more of a "code" design, and pick the language that would be easiest for you to meet that design.
Here's some requirements off the top of my head:
Supports code beautifying of these languages: Ruby, Python, Perl
Output code behaves identically to input
Output has consistent use of tabs/spaces
Output has consistent function naming convention
Output has consistent variable naming convention
Output has matching braces and indentation
Make as many as you want, it's your program. ;p I was kidding about the Perl, but I think every language you support is going to add a more work.
This question already has answers here:
Closed 12 years ago.
Possible Duplicate:
When do you use the “this” keyword?
In OOP sometimes we can write this.PropertyName = VALUE and sometimes we can skip this. and just write PropertyName = VALUE.
My questions:
Should we try always to use this.?
Does using / writing this have any effect on application performance or does it just make the code a little bit clearer?
There shouldn't be any difference in performance. Its purely a style decision.