Skip to main content

Dart Language meeting notes from Sept 17

Bob Nystrom posted the latest Dart language meeting notes to the mailing list. Bob writes:


Here's my notes from this weeks meeting:

0.11 language spec

I asked when we'd be publishing the next version of the language spec. Gilad says "real soon now". We keep making changes so we don't want to publish just to immediately invalidate something a few days later.

scope of type parameters

Gilad brought up what happens if you try to access a type parameter within a static method:

class Foo<T> {
  static bar() => T; // <- What does this mean?
}

Currently they are just not in scope, which means it could refer to some other outer name.

Instead, maybe we should say they are in scope, but you can't use them, which is consistent with other names inside a class.

Kasper says there one's scope. It doesn't matter whether you are on the instance or static side. You'll just get an error if you try to refer to something from the wrong side.

warnings on built-in identifiers

Gilad wonders if the warnings aren't helpful for things like "get" and "set" even though they are allowed. We discussed not showing a full warning but maybe some sort of "suggestion" that you shouldn't do that. We've decided to drop the warnings.

limited stack traces

The language spec was changed recently to state that when you get a stack trace in a catch, it only includes the stack frames from between the throw and the catch, but nothing past that. This means users can't get the full context for how an exception was reached.

Lars said the intent was can look at the catch handlers on the stack to see if you need to collect stack trace at all. We never intended it to be partial stack trace. The semantics were always intended to be entire stack trace.

Gilad will update the spec.

cascaded calls in initializer expressions

Right now, you have to parenthesize them, and we're not sure why. Gilad will look into the grammar and see if it doesn't work out.

lowercase string

Kasper said early on they discussed aliases for things like Integer -> int. But then they figured people would use a mishmash of both, which would be ugly and inconsistent. Instead, they chose to go with a single name for each built in type.

Lars said they looked at the built-in types and picked a list of them that they felt should have easier lowercase names. They didn't want all of them, so they had to draw the line somewhere. They are happy with "String" as it is.

Cheers!

Popular posts from this blog

Dart in 2016: The fastest growing programming language at Google, 2nd fastest growing in TIOBE Index

Dart was the fastest growing programming language at Google in 2016 with millions of lines of code written. It also made it to TIOBE Index Top 20 this month (see TIOBE's methodology).

It takes time to build something as ambitious as Dart and, in some ways, Dart is still in its infancy. But we're glad the hard work is starting to pay off.

Many thanks to our amazing community!

We're going to celebrate by ... releasing 1.22 next week (as per our usual 6 week release schedule).

The new Google AdSense user interface: built with AngularDart

AdSense is a free, simple way to earn money by placing ads on your website. The team just launched a completely new version of their app for publishers. Read all about it here. We asked Daniel White, the tech lead for the project, some questions because the new UI happens to be built with Dart and Angular2.


AdSense launched way back in 2003. How long is it since the last big redesign?
Last big redesign was called ‘AdSense 3’ and launched about 6 years ago. It was written in Google Web Toolkit (GWT) and the UI has evolved through several iterations - but this is the first ground-up redesign in 6 years. There are a number of long-standing UX issues that we’ve taken the opportunity to solve. A big shout-out to our UX team who’ve been 100% behind this project. We couldn’t have done it without them!

How many software engineers worked on the project?
Purely on the AdSense applications, we have a team of close to 100. Around 25% of them write Dart.

How many lines of code?
We have around 160K LO…

AngularDart 2.1 and new Components

AngularDart got its own dedicated team 5 months ago. Last month, we launched 2.0 final on the Dart Developer Summit. Today, we’re releasing the first minor release after that: 2.1.

Since the focus of AngularDart is Productivity, Performance, Stability, there are no major breaking changes (see the changelog) — but a lot of behind-the-scenes improvements. Your apps will get slightly smaller and faster (even relative to 2.0 which already made huge strides in size and performance since the compiled-from-TypeScript days).

Many features that AngularJS had to implement for JavaScript and TypeScript are not needed in Dart (because Dart already has those features out-of-the-box). So we’re removing them from AngularDart. Renderer is deprecated in favor of plain-old dart:html. NgPlural is going away — Dart programs can use the package:intl library.

New components

On the Dart Developer Summit, we launched AngularDart Components — the material design widgets Google is using in customer-facing apps …