disnet

import * as H from 'sweet.js/helpers' for syntax; 
syntax m = ctx => { 
  let v = ctx.next().value; 
  if (H.isIdentifier(v, 'foo') { 
    return H.fromString(v, 'bar'); 
  } 
  return H.fromString(v, 'baz'); 
} 
m foo; // expands to 'bar'

disnet

// log.js 
'lang sweet.js'; 
export function log(msg) { 
  console.log(msg); 
} 

// main.js 
import { log } from './log.js' for syntax; 
syntax m = ctx => { 
  log('doing some Sweet things'); 

disnet

// foo.js
'lang sweet.js';
export syntax m = // ... 

// main.js
'lang sweet.js'; 
import { m } from './foo'; 
m // ...

disnet

fetch("/foo.json").then(resp => { 
  return resp.json(); 
}).then(json => { 
  return processJson(json); 
});

disnet

operator >>= left 1 = (left, right) => { 
  return #`${left}.then(${right})`;
} 
fetch('/foo.json') >>= resp => { return resp.json() } 
                   >>= json => { return processJson(json) }

disnet

// the web is crazy
// http://stackoverflow.com/questions/736513/how-do-i-parse-a-url-into-hostname-and-path-in-javascript
function getLocation(href) {
    var location = document.createElement("a");
    location.href = href;
    // IE doesn't populate all link properties when setting .href with a relative URL,
    // however .href will return an absolute URL which then can be used on itself
    // to populate these additional fields.
    if (location.host == "") {
      location.href = location.href;

disnet

let function = macro {
	rule { $name (callback $arg $rest ...) { $body ... } } => {
		function $name ($arg $rest ...) {
			$body ...
		}
	}
}

function foo(callback cb, x, y, z) {
	cb(x + y + z);

disnet

macro m {
	rule { $x } => { var $x; }
}

m x

disnet

Syntax parameters allow us to play around with hygiene in a principled fashion.

stxParam it = function() { throw new Error("must be rebound"); };

let aif = macro {
    rule { ($cond ...) { $body ...} } => {
	var it_inner  = $cond ...;
	if (it_inner) {

disnet

### Keybase proof

I hereby claim:

  * I am disnet on github.
  * I am disnet (https://keybase.io/disnet) on keybase.
  * I have a public key whose fingerprint is 1CCB B2BE 266F 8706 733F  C4A7 07DF 8A2D E8B1 D193

To claim this, I am signing this object: