th507

// Y is the fixed point combinator. w1, w2, w3 are its building block.

// one level deep
var w1 = f => n => f( w1(f) )(n)
var Y = w1

// two level deep
var w2 = g => f => n => f( g(g)(f) )(n)
var Y = w2(w2)

th507

/* A step-by-step explanation (with generating Fibonacci Number): 
   From naïve self-referencing function to fixed-point combinator 
 */

// test runner
const t = (i => f => console.log(`v${i++}`, [1,2,3,4,5].map(f)))(1)

// 1 naïve approach
var fib = n => n < 2 ? 1 : fib(n - 2) + fib(n - 1)
t(fib)

th507

set os_version to system version of (system info)

if os_version as string < "11.0" then
	#display dialog "Smaller than 11"
	tell application "System Preferences"
		activate
		reveal pane id "com.apple.preference.general"
	end tell
	
	delay 0.5

th507

appName = "Finder"

app = Application(appName)

if (!app.running()) {
	app.activate()
}
else {
	if (! app.visible()) {
		app.activate()

th507

console.log(
(x => $$('div.a-section a.TitleLink')
.map(y => y.innerText)
.filter((name, bool) => (bool = (x !== name), x = name, bool))
.reduce((result, name, i) => `${result}${i + 1}. ${name}
`, "\n")
)()
)

th507

pref = Application("System Events").appearancePreferences
// weird syntax with no documentation...
pref.darkMode = !pref.darkMode()

th507

const fs = require('fs')
const child = require('child_process')

if (process.env.SUDO_UID === undefined) {
  console.log(`Permission denied
sudo required`)

  process.exit(1)
}

th507

let yCombinator = f => (g => (...p) => f(g(g))(...p))(g => (...p) => f(g(g))(...p))

var factory = f => (...a) => a.length - a[0].length > 1 ? f.call.call(...a) : f.bind(null, ...a)
//
//    we could add some fancy code to eliminate fn.call & fn.bind		
//			
//    var topsy = (f => f.bind(f))(Function.call)		
//    var turvy = (f => f.bind(f))(Function.bind)
//    var factory = f => (...a) => (a.length - a[0].length > 1 ? topsy : turvy(f, null))(...a)
//

th507

function *step(fn) {
  var arr = Array(fn.length);
  for (var i = 0; i < arr.length; i++) {
    arr[i] = (yield);
  }
 
  var gen = fn.apply(null, arr);
 
  return gen;
}

th507

# logging offline visits across sessions
# for in-house tracking and Google Analytics
# See my blog for more information (Chinese)
# http://ljw.me/2013/07/24/logging-offline-visits.html
# 
# Usage:
#
# var tracker = new FTCTracker(beaconURLPrefix)
# tracker.push(url)
#