#SCALA ARRAY CODE#

Res5: Boolean = true Concatenating Maps in Scala If the Map is empty, this returns true otherwise, false. Res3: Iterable = MapLike.DefaultValuesIterable(0, 1, 2) c. This returns an iterable with each value in the Scala Map. Res2: Iterable = Set(Ayushi, Megha, Ruchi)

This returns an iterable with each key in the Map. These are the basic operations we can carry out on a Map: a. Learn: Scala Arrays and Multidimensional Arrays in Scala Operations on a Map in Scala Now, to add a key-value pair to this, we do the following: scala> m+=('Ruchi'->2) So, we don’t need to include the type annotations. When we provide values, Scala will use those to infer the type of variables. Here, we must include the type annotation so it can assign proper types to the variables. Declaring an Empty Scala Map scala> var m:Map=Map() We can either declare an empty Scala map or one with values. Join DataFlair on Telegram!! Declaring a Scala Map This can sidestep the need to port every necessary library into APL itself.Stay updated with latest technology trends If you want to do something like making HTTP requests or ingesting XML files, you can write a function to do it and express the specific parameters for your use case in CL, and then have the function available within April using a simple monadic/dyadic argument API. In this way April puts the entire CL ecosystem at your fingertips. You can see an example on page 2 of this paper: It's also trivial to port functions from CL and its libraries into an April workspace.

That's why my APL compiler, April ( ), can be called within Common Lisp with CL data structures as its input and output. They are the best by far in their niche of working with arrays, but they can be harder to fit to some other kinds of tasks, especially when it comes to more semantic programming. It feels painful as a student to spend weeks writing and re-writing just to produce 2 lines of code, but in the end those 2 lines will be doing the work of 20 lines of Julia, or 200 lines of C, and feel like a pure, direct mathematical expression of the algorithm you intend.Īs an array language developer I may be a bit heretical in the community for my view that array languages are a domain-specific tool, not a general-purpose tool.

#SCALA ARRAY CODE#

In my (budding) experience, to 'get' APL you have to laser-focus on writing beautiful, concise code from the onset. This includes the tendency to reach for libraries, when you can, for example, implement an entire U-Net CNN in 30 lines of APL and be competitive with PyTorch performance. He had essentially tried to speak BASIC using C.ĪPL isn't an Algol-like, and you're probably going to have a bad time writing APL trying to use the cognitive tools and intuitions you have as a programmer of Algol-like or even functional languages. The funny thing is, when I looked at his main.c file, the entire code was written inside the main function, with copious use of gotos. After a few weeks of hacking, he presented me with a decent Asteroids clone, 'I don't see the point of C.' He got me to teach him basic C syntax and then took off on his own, writing a game. After many (mostly senseless) debates, I eventually convinced him to try C after showing some bodged-together flashy graphics demo. This reminds me of what a BASIC programmer friend of mine said about C when he first tried it. My personal interest in APL is for teaching (my daughter and her friend who I tutor really like learning math via APL, and we've successfully covered territory that previously I'd had no luck making progress on using more traditional methods) and for studying notation (which is what APL was originally designed for). My fave episode so far is the one with Aaron Hsu of co-dfns fame: If you haven't seen it before, The Array Cast is a really great podcast including interviews with some of the most interesting folks in the array programming world. In it I discuss my thoughts on array programming, including in PyTorch, numpy, Tensorflow, and other libraries and languages. Well this is unexpected - didn't think my little study group would appear on HN! :O Well anyhoo, all are welcome to join details in the linked thread (including playlist of last week's videos so you can catch up).Īs it happens, my interview on The Array Cast was just published today:

Scala array