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A comment on Hack: a new programming language for HHVM. Parent comment

Re:Hack: a new programming language for HHVM by ahoge on Thursday March 20, 2014 @07:09PM (#7439519)
> No: because Hack is bringing some additional language features [...]

TypeScript added classes, interfaces, modules, and arrow functions.

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Re:Hack: a new programming language for HHVM by ufo on Friday March 21, 2014 @07:35AM (#7441656)
The key difference is affecting the runtime. All those typescript features can be compiled down to regular JS and typescript-generated javascript can be run in a browser without extending the JS engine.
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