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The unification-fd library referenced in the article is probably a pretty good example. I have not looked at it, though, and it would be nice to have explicit bits of code pointed out in an explanation. AlexCoventry on Oct 12, Anyone got some good examples of this? Instead, polymorphism provides correctness guarantees by ensuring that a particular function can only touch the specific layers of functors in its type signature and is independent of the rest of the data structure.

One benefits from polymorphism even when a function is only ever invoked at a single type. Even though you don't call summarize1 polymorphically, the signature tells you that it's only looking at the structure of the list rather than what's inside it - a reader can immediately see that it's going to do something like return the length of the list.

Whereas summarize2 could do other things, e.

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A list is a pretty simple structure, these kinds of guarantees become more useful when the structure itself is complicated. Imagine you need a 2-parameter "Lasagna" datatype wich is a non-empty list of alternating "a" and "b" elements. It could be used to model something like a timeline, perhaps.

Instead of constructing it by hand, you could express it as a composition of other stuff: import Data. NonEmpty import Data. Bifunctor import Data. That type has a whole bunch of useful instances without even having to auto-derive them. And you could have functions that manipulated the pairs without caring what shape the "outer functor" has. It would be nice to know what kind of code OP writes. Usually I find that Haskellers write very "low-level" code, ie.


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This style is plenty useful in "higher level" stuff. Reflex is a library, used to create applications. Yes, but typical uses would be mobile apps and web apps, pretty "high level" stuff. The entire library abstracts over its implementation via the "Reflex" class. Bromskloss on Oct 11, With a math concept, the elegant concept already exists beforehand, and you just implement it.

With application code, there might be 27 different but-ifs, and-also-remembers that you need to consider, where developing an elegant, coherent concept of the entire app is very challenging, or even impossible. And then a new corner case appears and my model falls on the floor, and needs to be redesigned. It's not the same thing, but it triggered something. It's basically a functional programming language where functions can be applied to a type.

The type is then passed as the first parameter. That's just OO without encapsulation.

See a Problem?

No, it's just some sugar over plain old functions. Right, but there's more to classes in Python than just methods inheritance etc. Inheritance is not essential to OO; it is merely a method of sharing code. Sure, and functions are just sugar over goto's.

Are you suggesting that the difference between a. Functions give structure and restrictions to goto. Method syntax is just a different way to write the exact same thing. I'm suggesting all of programming is syntactic sugar. Calling something syntactic sugar is not a valid critique. I wasn't critiquing anything, just suggesting that moving the first argument of a function call to come before a. There's typically more to OO than just method syntax. Dynamic dispatch, subtyping, etc. And saying something is OO without encapsulation isn't really saying anything, given that encapsulation is arguably the most important part of OO.

I'd argue that, it's not remotely the most important part nor is sub-typing. Encapsulation encourages better OO, but you can take a well encapsulated OO program, and remove all encapsulation by making all the data public, and that program is still a well structured OO program. OO is about the way objects talk to each other to accomplish work, the message, the API between objects; it's not about the many little things like encapsulation that encourage better messaging. There are dozens of practices that encourage better OO, but you can write good OO without them if you know what good OO is and don't need those training wheels.

If you don't have encapsulation, then you're not just using messages to talk between objects.

Analysis Functor Natural Language Of

If you are, then you have encapsulation. Well, now we have to get semantic; if by encapsulation you mean you keeping your data private and only exposing behavior publicly, then you're wrong. If by encapsulation you mean all behavior that uses an objects data is in the object and no outside code relies on that objects data even if it is public, then you're agreeing with me. You clearly didn't play out my thought experiment above or you wouldn't be making the statement you just made.

I agree that in your thought experiment, the program remains OO, but the language is not. You can write OO programs in many languages, but I would argue that you don't have an OO language unless it has special support for OO programming. I wasn't arguing it was an OO language, merely that it was OO code.

OO used to be done in C in exactly the same basic way, passing the struct that is the object as the first arg to all the member functions; Python does this explicitly as well. OK, I was talking about whether or not the language was OO. So I guess we're in agreement then :. It reminds me a of the S3 single-dispatch polymorphism in R.

A strict type system makes sure your program is statically correct, and catches many bugs caused by the programmer. A transition moves one token from the buffer to the stack, removes a token from the stack, or creates a dependency. Other systems may have different transitions or additional stack etc. As of , transition-based dependency parsing holds the state-of-the-art in dependency parsing and create buzz beyond research circles with Google Parsey McParseface's release.

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Transition-based approach

Swayamdipta et al. Zhang et al. Experiments demonstrate that data-driven models with appropriate transition systems can produce high-quality deep dependency analysis, comparable to more complex grammar-driven models. All bound expressions appearing in a set are equal in the concrete. The FunArray can be naturally combined via reduced product with any existing analysis for scalar variables. The bound expressions, the segment abstractions and the reduction operator are the three parameters of the analysis.


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Once the functor has been instantiated with fixed parameters, the analysis is fully automatic.