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JSX
1.
JSX DeNA Co., Ltd.
Kazuho Oku
2.
What is JSX? Apr
5 2012 Copyright © 2012 DeNA Co., Ltd., All rights reserved 2
3.
kind of a
skunk-works project I have been doing for the last week or two… (together with gfx) Apr 5 2012 Copyright © 2012 DeNA Co., Ltd., All rights reserved 3
4.
Existing problems with
JavaScript low productivity requires skills to write fast and maintainable code esp. in medium to large-scale development slow esp. on iOS (without JIT) memory-consuming esp. on JavaScript runtimes with JIT support Apr 5 2012 Copyright © 2012 DeNA Co., Ltd., All rights reserved 4
5.
JSX is…
a strictly-typed OO language convertible to JavaScript and runs faster than JavaScript on web browsers Apr 5 2012 Copyright © 2012 DeNA Co., Ltd., All rights reserved 5
6.
JSX as a
programming language strictly-typed OO programming language syntax: class / function definition like Java function body is JavaScript strict types lead to higher productivity / better quality than JavaScript higher productivity / better quality than C / C++ (JSX has GC, no pointers) Apr 5 2012 Copyright © 2012 DeNA Co., Ltd., All rights reserved 6
7.
JSX to JavaScript
compiler generated code runs faster than JS by optimizing the generated code using type-info JSX is designed so that there would be no overhead when compiled to JavaScript interoperable with JavaScript generates source-map for debugging source-map is a technology that supports debugging of client-side code on web browsers written in languages other than JavaScript Apr 5 2012 Copyright © 2012 DeNA Co., Ltd., All rights reserved 7
8.
The goal of
JSX run faster than JavaScript on browsers higher productivity than JavaScript applications developed using JSX will have higher quality than when using JavaScript Apr 5 2012 Copyright © 2012 DeNA Co., Ltd., All rights reserved 8
9.
Comparison: Google Web
Toolkit write in Java / translate to JavaScript differences bet. Java and JS leads to… different behaviors between when run on Java and on JavaScript makes debugging is difficult the translation introduces speed / size overhead hard to use in conjunction with JS libraries cannot use existing Java code as well JSX has none of the problems listed above Apr 5 2012 Copyright © 2012 DeNA Co., Ltd., All rights reserved 9
10.
Comparison: Google Closure
Compiler a JavaScript minifier can use type-annotations to optimize JS problem: type-annotations are fragile hard to write, impossible to maintain JSX does not have the problem strict types promise higher productivity and performance: all optimizations possible by Closure Compiler can be applied initial versions of JSX will generate fully type-annotated code and pass it to Closure Compiler Apr 5 2012 Copyright © 2012 DeNA Co., Ltd., All rights reserved 10
11.
Comparison: Dart
promoted by Google as an replacement of JavaScript optionally-typed OO language Problems: slower than JavaScript when converted to JS unlikely to be supported by web browsers other than Chrome (as a native language) unlikely to run at native performance optionally-typed languages usually require JIT support to run fast Apr 5 2012 Copyright © 2012 DeNA Co., Ltd., All rights reserved 11
12.
Comparison: ActionScript 3
an extension of JavaScript with classes and optional types Problem: cannot be translated to JavaScript without big performance penalty unlikely to run at native performance optionally-typed languages usually require JIT support to run fast Apr 5 2012 Copyright © 2012 DeNA Co., Ltd., All rights reserved 12
13.
Sample code
import "./foo"; // import foo.jsx to current scope import "./bar" into Bar; // refer to the classes as Bar.clazz class Fib { static function fib(n : number) : number { if (n < 2) return 1; else return fib(n - 1) + fib(n - 2); } } Apr 5 2012 Copyright © 2012 DeNA Co., Ltd., All rights reserved 13
14.
Sample code (cont'd)
class FizzBuzz { static function main(args : String[]) : number { for (var i = 0; i < 100; i++) { if (i % 15 == 0) log "FizzBuzz"; else if (i % 3 == 0) log "Fizz"; else if (i % 5 == 0) log "Buzz"; else log i; } } } Apr 5 2012 Copyright © 2012 DeNA Co., Ltd., All rights reserved 14
15.
Design notes on
JSX no global namespace namespaces exist for each source file classes in imported source files will be expanded the top-level namespace (or to the specified namespace) primitive types: void, null, boolean, int, number, String int: introduced for future usage on JS, additional overhead only for div and mod operations (by "| 0", etc.), which are rarely used functions and member functions: can be overloaded (internally uses name mangling) accessing the arguments object is slow in JS function references and member function references are first-class objects Apr 5 2012 Copyright © 2012 DeNA Co., Ltd., All rights reserved 15
16.
Design notes on
JSX (cont'd) built-in log and assert statements no code will be emitted for release builds support for typed arrays will fallback to normal array if not supported by the platform primary target: to support games on HTML 5 compiler is written in JavaScript so that it could be run on the web browser for faster development cycle will be ported to JSX once self-hosting becomes possible will be a good test code may use a preprocessor so that the compiler could be interpreted as both JS and JSX Apr 5 2012 Copyright © 2012 DeNA Co., Ltd., All rights reserved 16
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