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JSX is some common language extensions for JavaScript.

Features

Markdown comments

Markdown can be written in files at the top level. To write code, you indent 4 spaces. This allows documentation to look prettier, and for files to be more elegantly laid out.

(function() {

All code that it output is automatically wrapped inside of a self-extracting function. This is a good idiom which should be used regularly, so incorperating it into a language as standard makes sense.

"use static"

Just like the self extracting function before, 'use static' is added to the top of every file when code is compiled.

multiline strings

Strings can be opened on one line, and continue onto the next.

var helpText = 
    "here is some help text
     which spans several lines
     and I can end it further down
     right here" ;

== is gone!

Well, kinda. The double equality operator is silently translated into the triple equality operator. This is simply due to the fact that the double equality operator is a failing in JS, and triple equals should always be used instead for added safety.

The same is also true with the != operator, which translates to !==.

Project Structure

Src is split into three sections:

  • client - where the files for the command line compiler are stored
  • lib - where files for the library version of JSX is stored (for platform.js)
  • jsx - everything that goes in both client and lib