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function insertPlayground(lang, optSource) {
  var fromString = (lang.fromString || fail('language object must have a fromString method')).bind(lang);
  var evalAST = lang.evalAST ? lang.evalAST.bind(lang) : undefined;
  var transAST = lang.transAST ? lang.transAST.bind(lang) : undefined;
  if (!evalAST && !transAST) {
    fail('language object must have either an evalAST or a transAST method');
  }

  var syntaxHighlight = lang.grammar.semanticAction({
    number: function(_) {

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var file = document.querySelector(".file");
file.style.margin = 0
var body = document.createElement("body");
body.appendChild(file);
document.body = body;

zhxnlai

Zhixuan's One Pager

Hi, my name is Zhixuan Lai. I am a undergraduate student at UCLA interested in client side application and programming language.

I have played with many client side technologies:

Games

Last spring, I spent a lot of time on learning Unity3d game engine. It enabled me to make mobile multiplayer games using AR and VR technologies (e.g. Vuforia and Oculus Rift), two of which (Horoscoper and Spacinarium) won me hackathon prices.

zhxnlai

# To pngs 1 frame per second 
# https://trac.ffmpeg.org/wiki/Create%20a%20thumbnail%20image%20every%20X%20seconds%20of%20the%20video
mkdir frames && ffmpeg -i video.mov -vf fps=1 frames/ffout%03d.png

# screen recording to gif
mkdir bufferFrames && ffmpeg -i video.mov -vf scale=320:-1 -r 30 bufferFrames/ffout%03d.png && convert -delay 4.167 -loop 0 bufferFrames/ffout*.png ZLHistogramAudioPlotBuffer.gif

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// stores an array of images (PImage[]) for each scene
ArrayList<PImage[]> scenes;
// keeps track of the index of the current scene
int sceneIndex = 0;
// used to animate the images of the current scene
int frameIndex = 0;

// keep track of the last mouse position
float clickedX;
float clickedY;

zhxnlai

Math 115A

Chapter 1

1.2-1.6

Definitions

• Definition of a vector space

---

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function click(el) {
	var evt = document.createEvent("MouseEvents");
	evt.initMouseEvent("click", true, true, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null);
	el.dispatchEvent(evt);
}

function click2(el) {
	var evt = document.createEvent("MouseEvents");
	evt.initMouseEvent("mousedown", true, false, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null);

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function getCharCodes(s) {
  return s.toUpperCase().split("").map(c => c.charCodeAt(0))
}

function zip(a, b) {
    return a.map((char,i) => [char, b[i % b.length]]);
}

function decrypt(ciphertext, key) {
  const plaintextCharCode = zip(getCharCodes(ciphertext), getCharCodes(key)).map(pair => (pair[0] - pair[1] + 26) % 26 + "A".charCodeAt(0))

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// get a global concurrent queue
let queue = dispatch_get_global_queue(QOS_CLASS_USER_INTERACTIVE, 0)
// submit a task to the queue for background execution
dispatch_async(queue) {
    let enhancedImage = self.applyImageFilter(image) // expensive operation taking a few seconds
    // update UI on the main queue
    dispatch_async(dispatch_get_main_queue()) {
        self.imageView.image = enhancedImage
        UIView.animateWithDuration(0.3, animations: {
            self.imageView.alpha = 1

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dispatch_promise {
    return self.applyImageFilter(image)
}.then { enhancedImage in
    self.imageView.image = enhancedImage
    return UIView.animateWithDurationPromise(0.3) {
        self.label.alpha = 1
    }
}.then {
    // add code to happen next here
}