m-radzikowski

#!/usr/bin/env bash

set -Eeuo pipefail
trap cleanup SIGINT SIGTERM ERR EXIT

script_dir=$(cd "$(dirname "${BASH_SOURCE[0]}")" &>/dev/null && pwd -P)

usage() {
  cat <<EOF
Usage: $(basename "${BASH_SOURCE[0]}") [-h] [-v] [-f] -p param_value arg1 [arg2...]

sebmarkbage

let cache = new Map();
let pending = new Map();

function fetchTextSync(url) {
  if (cache.has(url)) {
    return cache.get(url);
  }
  if (pending.has(url)) {
    throw pending.get(url);
  }

krisselden

var assert = require('assert');

global.KEYS = JSON.parse(require('fs').readFileSync('bindings.json','utf8'));
global.RESULT = false;
global.CHARAT = function (key) {
  var l = key.length;
  return l > 7 &&
    key.charAt(l - 7) === 'B' &&
    key.charAt(l - 6) === 'i' &&
    key.charAt(l - 5) === 'n' &&

krisselden

trace-deopt.sh

How to use

./trace-deopt.sh http://localhost:4200

Wait until your page renders.

paulirish

What forces layout / reflow

All of the below properties or methods, when requested/called in JavaScript, will trigger the browser to synchronously calculate the style and layout*. This is also called reflow or layout thrashing, and is common performance bottleneck.

Generally, all APIs that synchronously provide layout metrics will trigger forced reflow / layout. Read on for additional cases and details.

Element APIs

Getting box metrics

• elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent

hjdivad

Consider the example:

var MyObject = Ember.Object.extend({
  selectedContent: Ember.computed.filterBy('content', 'isSelected')
});

var obj = MyObject.create({
  content: [
    Em.Object.create({name: "one", isSelected: false}),
 Em.Object.create({name: "two", isSelected: false})

machty

router.js Architecture

Let this serve as a guide for anyone who'd like to dig into router.js's internals, understand what's going on, and hopefully contribute!

Scope of router.js (et al)

router.js is most popularly known as the routing microlib used by the Ember.js Router, though other folk have been known to use it beyond Ember, including some Angular folk who weren't satisfied with

lukemelia

var empty, get, set,
  __hasProp = {}.hasOwnProperty;

get = Ember.get;
set = Ember.set;

empty = function(obj) {
  var key;
  for (key in obj) {
    if (!__hasProp.call(obj, key)) continue;