Dart: A Replacement for JavaScript and Why You Should Care

Dart A Replacement for JavaScript and Why You Should Care Kevin W. Gisi Senior Interactive Developer, Roundarch Isobar @gisikw | kevin@kevingisi.comhttp://kevingisi.com | http://hasmanyreasons.com

What is the Perfect Language?

Language? (hacker)AccessibleIntuitiveAdaptableFast...enough

Language? (hacker)RubyPythonJavaScriptPHP (just kidding!)

Language? (academic)Turing completeFormally veriﬁableFast...no, faster

Language? (academic)PrologLISPJava / C++ / C#

Language? (reductive)Minimize miseryGet the right answer

Language? (reductive)Hackers: happyAcademics: correct

Language FastWrong Right Slow

Language Fast JavaWrong Right Slow

Language FastWrong Right Java Slow

JavaStatically typedCompiledCompile-time checkingFast (optimized)

Java DemoPlease ﬁnd the annotated code at:https://gist.github.com/2410232

Language Fast RubyWrong Right Slow

RubyDynamic typingDynamic languageRuntime type-checkingSlow (comparatively)

Ruby DemoPlease ﬁnd the annotated code at:https://gist.github.com/2410328

Language FastWrong JS Right Slow

Language FastWrong JavaScript Right Slow

JavaScriptDynamic typingDynamic languageNot as horrible as it used to be!

JavaScriptNot realAlmost as many () as LISPNo classesIncredibly popular

Dart http://dartlang.org Optionally typed VERY Alpha Compiles to JavaScript

Language Fast DartWrong Right Slow

Dart void main() { print(Hello, world!); }

Optional Typing1. Implement runtime type-checking2. Ignore runtime type-checks3. ???4. Proﬁt!

Dart String toString(int x) { return x.toString(); } void main() { print(toString(5)); }

Dart toString(x) { return x.toString(); } main() { print(toString(5)); }

Dart toString(int x) { return x.toString(); } toString(double x) { return x.toString(); } main() { print(toString(5)); }

Dart String toString(int x) { return new TotallyNotString(); } main() { print(toString(5)); }

Optional TypingTypes are annotationsCan’t infer method signaturesCan warn when typing is violatedProvides comment shorthand

Ruby Testing describe MyUtils do describe ‘#acceptable_params’ do a = MyUtils.acceptable_params a.should be_an Array end end

Optional Typing

Optional Typing Lies

Dart DemoPlease ﬁnd the original CoffeeScript code at: https://github.com/gisikw/jMate Please ﬁnd the Dart implementation at: https://github.com/gisikw/dartChess

Dart VERY Alpha Sound programming Almost exactly Java Easy to refactor

Dart (verdict) Not going to take off No jQuery support Too large a transition

Lessons for Academics Optimize for performance AND for composition Can move from unstable to stable code Pragmatism

Lessons for Hackers Leverage optimization Consider costs of dynamism (testing) Move toward veriﬁcation

Thank you!

Dart: A Replacement for JavaScript and Why You Should Care

by Kevin Gisi

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