piyushchauhan2011

package astar

import "container/heap"

type NodeQueue []Node

func NewNodeQueue() NodeQueue {
	return make(NodeQueue, 0, 1000)
}

piyushchauhan2011

const I = x => x;
const K = x => y => x;
const A = f => x => f(x);
const T = x => f => f(x);
const W = f => x => f(x)(x);
const C = f => y => x => f(x)(y);
const B = f => g => x => f(g(x));
const S = f => g => x => f(x)(g(x));
const P = f => g => x => y => f(g(x))(g(y));
const Y = f => (g => g(g))(g => f(x => g(g)(x)));

piyushchauhan2011

<x-vue yell>World</x-vue>

piyushchauhan2011

document.getElementsByTagName('button')[0].onclick = function () {
   scrollTo(document.body, 0, 1250);   
}
    
function scrollTo(element, to, duration) {
    var start = element.scrollTop,
        change = to - start,
        currentTime = 0,
        increment = 20;
        

piyushchauhan2011

// Lack of tail call optimization in JS
var sum = function(x, y) {
  return y > 0 ? sum(x + 1, y - 1) :
         y < 0 ? sum(x - 1, y + 1) :
         x
}

sum(20, 100000) // => RangeError: Maximum call stack size exceeded

// Using workaround

piyushchauhan2011

onScroll(ev){
  const yOffset = window.window.pageYOffset;
  for(let elm of myElement){
    elm.isVisible = yOffset >= elm.rect.top && yOffset <= (elm.rect.top + elm.rect.height);
  }
}

piyushchauhan2011

import { EventEmitter } from 'angular2/core.js';

/**
 * Visibility Observer leveraging new IntersectionObserver API
 * Idea from: https://github.com/WICG/IntersectionObserver
 */
export class VisibilityObserver {
  
  onVisible = new EventEmitter();

piyushchauhan2011

export class VisibilityObserver {

  constructor(element, callback) {
    this.callback = callback;
    
    if(window.IntersectionObserver) {
      this.observer = new IntersectionObserver(
        ::this.processChanges, { threshold: [0.5] });
        
      this.observer.observe(element);

piyushchauhan2011

var element = document.getElementById("panda");

function checkVisibility() {
  var bounds = element.getBoundingClientRect(),
      visible = bounds.width && bounds.height;
      
    if (visible) {
      doMySizeMagic();
    } else {
      setTimeout(checkVisibility, 100);

piyushchauhan2011

#Haskell, Stack and Intellij IDEA IDE setup tutorial how to get started Upon completion you will have a sane, productive Haskell environment adhering to best practices.

Basics

• Haskell is a programming language.
• Stack is tool for Haskell projects. (similar tools for other languages include Maven, Gradle, npm, RubyGems etc)
• Intellij IDEA IDE is a popular IDE.

Download and extract Stack

Don't install Haskell, Stack, Cabal or any other Haskell tool or library using your OS package manager or using Cabal.