adohe-zz

//All this following function expression will 
//throw the refrence error, which will raise
//when de-referencing an invalid reference
(function foo() {
	console.log('hello world');
})();
//foo();

!function foo() {
	console.log('beep boop');

adohe-zz

//remove array element function
//JavaScript 1.8
function RemoveElement(array, element) {
  !!let (pos = array.lastIndexof(element)) pos != -1 && array.slice(pos, 1);
}

var array = [1, 2, 3, 4, 5];
var pos = array.indexOf(2);
pos > -1 && array.slice(pos, 1);

adohe-zz

public final class Outer {
  //The anonymous inner class
  Object anonymous = new Object() {};
  
  {
    class Local{}
    Local l = new Local();
  }
  
  Outer() {

adohe-zz

//The following cases occur during the compile time
public final class Cr {
  //Constant folding
  static final int num1 = 1;
  static final int num2 = 2;
  static int num3 = 3;
  static int num4 = 4;
  
  //Method overload
  void func(String s) {

adohe-zz

   
   concurrent connections and connection per second are two different beasts. 
To handle 1m concurrent connections a traditional synchronous server would 
create 1m threads (or worst, processes) with all the stacks and memory needed. 
Node handles that in a sngle thread, but the more connections there are, the 
bigger latency per request is need to handle them. because it's single-threaded, 
you can however utilize the cluster module to use more than one cpu core on your 
machine.
   But to handle 1m connections per second, this is about latency, and this you 
can only get for the price of higher resource usage. cluster module, horizontal 

adohe-zz

//Get the object property descriptor
var obj = {beep: 'boop'};
console.log(Object.getOwnPropertyDescriptor(obj, 'beep'));

//Modify the objct property descriptor
var obj = {beep: 'boop'};
Object.defineProperty(obj, 'beep', {
  value: 'beep',
  writable: false,
  enumerable: false,

adohe-zz

public final class Art {
  
  private static void checkRange(String s1, String s2) {
    if(s1 == null || s2 == null)
      throw new NullPointerException("null");
    if(s1.length() == 0 || s2.length() == 0)
      throw new IllegalArgumentException("zero");
    if(s1.length < s2.length())
      throw new IllegalArgumentException("length error");
  }

adohe-zz

//Master.js
var cp = require('child_process');
var fork = require('child_process').fork;
var spawn = require('child_process').spawn;
var cpus = require('os').cpus();

//Use fork to crate new process
for(var i = 0; i < cups.length; i++) {
  fork('worker.js');
}

adohe-zz

1.Get the max and min number in the array of numbers
  var arr = [1, 2, 3, 4, 5];
  var max = Math.max.apply(Math, arr);
  var min = Math.min.apply(Math, arr);
  
2.Empty the array
  var arr = [1, 2, 3];
  arr.length = 0;
  
3.Don't use delete to move an item in the array

adohe-zz

var stream  = require('stream');

var s = new Stream;
s.readable = true;


VS:

var stream = require('stream');
var Readable = stream.Readable;