Announcing Dart 2 Stable and the Dart Web Platform

Post by EugeneOZ » Tue, Aug 07, 2018, 6:55 PM UTC

rhencke wrote: post #95

EugeneOZ wrote: post #89

Earlier quoted context omitted.

To be dynamic, "Any" should be able to represent literally ANY type. As you can find, Any is a reflection-wise trait to work with static types. It's not something what you can use when you don't know type and language will dynamically convert it. You can't write fn example(foo: Any) -> u32 { foo+55 } as you CAN do in dynamic languages. Do you understand me now? Or we will keep talking about unsafe extra special types…

Please remember there's a genuine human on the other end, trying to have a respectful conversation with you.

Post by beckler » Tue, Aug 07, 2018, 7:10 PM UTC

kasperpeulen wrote: post #12

fullofsid wrote: post #9

Anybody using only dart for their mobile apps, how has been your experience with it? Where does it triumph & fail over RN??

Pros: * Flutter is faster. You really notice that for example the animations in flutter are much smoother than in RN * Flutter has really fast development cycle with hot reload ( * Writing UI only once for both iOS and Android * Better documentation * Better tooling support in editors (VSCode and Intellij) Cons: * The Flutter ecosystem is quite small, there are many lacking plugins * The Dart ecosystem is way smaller…

Post by beckler » Tue, Aug 07, 2018, 7:18 PM UTC

jorblumesea wrote: post #16

Flutter is going to make/break Dart. If flutter takes off, Dart is saved. Otherwise, looks bleak.

Post by xfer » Tue, Aug 07, 2018, 7:34 PM UTC

foldr wrote: post #96

EugeneOZ wrote: post #89

Earlier quoted context omitted.

To be dynamic, "Any" should be able to represent literally ANY type. As you can find, Any is a reflection-wise trait to work with static types. It's not something what you can use when you don't know type and language will dynamically convert it. You can't write fn example(foo: Any) -> u32 { foo+55 } as you CAN do in dynamic languages. Do you understand me now? Or we will keep talking about unsafe extra special types…

You can do that if you change it to &Any and then downcast. See the docs for examples. If the issue is that you have to downcast, then your initial claim that Rust lacks void pointers was irrelevant even if true, since you also have to downcast a void pointer in C before you can perform operations on the type that it's actually pointing to.

Post by drb91 » Tue, Aug 07, 2018, 7:36 PM UTC

EugeneOZ wrote: post #59

drb91 wrote: post #49

Earlier quoted context omitted.

Most languages I can think of have this type, from void* to dyn to bounding by the root of the type hierarchy. Not all languages. However, what is c, c++, java, rust, go, if not statically typed? Ambiguously typed? Seems like not a useful distinction to make. I argue static typing is the ability to static type up to 100% of a program, not the exclusion of a dynamic type.

Rust doesn't have such type. And type annotations in Dart are optional - when programmers are not obliged to use them, guess what will happen? They do NOT use them. People are lazy. Dart's types exist only on compilation step. You can try to use "strong mode" in theory, in practice you will never compile it with third-party libraries.