es6-arrows.sjs

// sweet.js arrow function macro
// https://github.com/mozilla/sweet.js/

macro => {
  rule infix { ( $arg:ident (,) ... ) | { $body ... $last:expr } } => {
    (function ( $arg (,) ... ) {
      $( $body) ...
      return $last
    }).bind(this)
  }
  rule infix { ( $arg:ident (,) ... ) | $last:expr } => {
    (function ( $arg (,) ... ) {
      return $last
    }).bind(this)
  }
  rule infix { () | { $body ... $last:expr } } => {
    (function ( ) {
      $body ...;
      return $last
    }).bind(this)
  }
  rule infix { $x | { $body ... $last:expr } } => {
    (function ($x) {
      $body ...;
      return $last
    }).bind(this)
  }
  rule infix { $x | $last:expr } => {
    (function ($x) {
      return $last
    }).bind(this)
  }
}

// From the docs, looks much easier, untested.

// macro (=>) {
//     rule infix { $param:ident | $body:expr  } => {
//         function ($param) { return $body }
//     }
// }

var addOne = x => x + 1;
var square = x => x * x;

console.log(addOne(41));
console.log(square(23));

console.log([1,2,3].map(x => x + 5));