Most beautiful programming language feature | Chris Lattner and Lex Fridman 

Would love to see one of the authors of Julia language interviewed here

Algebraic Data Types and exhaustive pattern matching are beautiful language features that enable the creation of high quality libraries. Both of these are fundamental core features of Haskell, OCaml and F#.

My favourite features in JavaScript is the spread operator and optional chaining. One of the cool things about JavaScript is that you can use features like these before they are in the specification with tools like Babel, so you can technically add your own language features which I think is really empowering.

I felt the same way with list comprehension and the declarative style of programming which lead me on to a journey to haskell. The fact you can create everything in a declarative style makes it composable and composition is beautiful. Edit : typo

The broadcast operator in Julia is amazing.

Talk about scratch next. The way you can drag block into each other, truly Elegant!

.NET (and C#) actually did something right when they added the notion of ValueTypes. A variable of type "int" (System.Int32), or even a "bool" value, may be like any other object from a class but they are being passed by value. I started with .NET, and when I went to Java at college, I got instantly confused that you had to constantly wrap primitive types in classes and lose the value semantics. In .NET this is handled for you by the runtime. The methods are always available on value types. Not to forget the type-erasure generics (Java) vs. runtime generics (.NET). In .NET value is an object, albeit with difference semantics for variables based on type.

First-class functions are an addiction

excellent clip! programming, from my beginner's eye, is a game unto itself; you called it a bicycle for the mind. In either case, it does need a more collaborative effect for change. How to convince the ruling bodies such as W3C of such proposals. Hmmm

0:16 list comprehensions are my favorite things ever!

Proud to see smart men talking about things that really matter. Great job, guys

The ROI / cost+benefit part of this is something I hope everyone can appreciate.

Python's long int. How many bits? It's as long as you need. No overflows.

Functional options in languages like Python and Java are very satisfying to use. I'm glad functools has been basically integrated into newer python versions. The syntax and elegance of streams in java and builtin (map, reduce, filter) in python gets me everytime

It really annoys me when a novel language does not allow me to do ++i%=7; That is such an often-useful expression.

It's a little silly to say Int is not a built-in type in Swift. The implication seems to be that there are no special types in Swift, so everything is democratic and user-defined types are just as good as the built-ins. But that's silly since _some_ type has to have a special relationship with the compiler since _something_ has to talk to the hardware. In Swift, that's just e.g. Builtin.Int64, so the only reason Int doesn't have a special relatiosnhip with the compiler is because Builtin.Int64 does! To be fair to other languages, you should compare e.g. int in C with Builtin.Int64 in Swift, and you'll find that (apart from the fact that Builtin.Int64 has crummy syntax) they behave almost identically, as they must. What's more, the Builtin module is not really available for regular programs, only the stdlib. So even Int itself is a special type that an ordinary library developer couldn't write!

Streams and lambdas make me love Java.

Linq in c# is 💯

swift function labeled parameters shouldn't have order

I agree that libraries are important but making the language too extensible destroys readability because you think you know what "+" means but operator overloading can make it very difficult to understand the code you see because + could be redefined to be "-" making the code unreadable - the same is true for compile time macros. The use of int built into the language is less extensible but it allows the compiler to optimize better. Java, for instance, has both int and Integer - one is value and the other is Object. Really valuable for creating libraries are machine independent byte code, garbage collection and built in thread operators since the library can use these features transparently to the application.

Had a 2s hesitation before hitting the like button... because the "likes counter" was saying 256... and didn't want to make it 257 XD

Did he answer the question?

I like promises in Javascript.

0:59

Native support for dozenal :)

Is Python the only language Lex knows? It's the only one I've ever heard him talk about.

Swift can't for (;;i++) ?

First Class Functions !

Operator overloading is not an invention of swift

Lex: You are literally creating suffrage in the world. Chris: Its for your own good and I'm totally justified before even considering your comment.

You cannot underestimate JavaScript. I love Python. But in combination with typescript JavaScript is extremely elegant.

I agree fully. Arrays in c++ produce a lot of bugs

I bet all that int beauty costs ya in compile time. this is a fine conversation tho.

I like function in HTML

I LOVE CODEEEEEEEEEEEEEE

Swift has the most beautiful syntax of the languages.

i = :)

8:46 the absence of a c style for loops and the short hand incriminators in swift is annoying. It didn't aid design, not to mention their lacklustre implementation of terrible new design practices/ keywords and paradigms has made a massive mess of the language and thoroughly fucked them over. You can see it in the way the language is evolving. They make rash stupid design choices and then there is a tidal wave of poor choices to firefight the consequences of it. That said I will take it over ObjC any day. It sure as shit looks like its going to be just as bad as that ended up by the end though.

JavaScript is the most beautiful programming language

Python: [x for x in range(1, 101) if myFunc(x)] Swift: (1…100).filter { myFunc($0) }