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// taken from https://www.sitepoint.com/object-oriented-javascript-deep-dive-es6-classes/
let SimpleDate = (function() {
  let _years = new WeakMap();
  let _months = new WeakMap();
  let _days = new WeakMap();

  class SimpleDate {
    constructor(year, month, day) {
      // Check that (year, month, day) is a valid date
      // ...

ernestlv

function callWhenReady(callBack, sec) {
  var wait4Loop = ( sec || 5 ) * 4; 
  var loopNum = 0;
  var domCount = document.querySelectorAll('*').length; //count DOM elements
  var i = setInterval(function(){ // after 1/4 of a sec
      var newCount = document.querySelectorAll('*').length; //count DOM elements
      if (domCount != newCount){ // new DOM elements are counted, page still loading
          domCount = newCount;
          loopNum = 0;
      }else{ // wait X sec if node count does not change, page likely finished loading.

ernestlv

function smallInt(A) {
    let s = 1;
    A.sort((a, b) => a - b)
    if (A[0] >= 0) {
        if (A.indexOf(1) === -1) {
          return 1;
        }
    }
    for (i=0; i<A.length; i++){
        s = A[i]+1;

ernestlv

function solution(A) {
    var red = A => A.reduce((res, val) => res+val);
    for (i=0; i<A.length; i++){
        var z = i
        for (j=0, z=i; j<=i; j++, z--){
            x = red(A.slice(j, A.length-z));
            if (x>=0) return A.length-z-j;
        }
    }
    return 0;

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function callWhenReady(testCB, readyCB) {
  console.log('checking for page ready');
  var i = setInterval(function(){ // after 1/4 of a sec
  	  var res = testCB();
      if (res === true){ // wait X sec if node count does not change, page likely finished loading.
              clearInterval(i);
              readyCB();
      }
  }, 250);
}

ernestlv

function isOneSwapSort(A){
	for ( let f = A.length - 1; f > 0; f--) {
	    for (let i=0; i<f; i++) { 
	    	if ( A[f] < A[i] ){
	    		let temp = A[i];
	    		A[i] = A[f];
	    		A[f] = temp;
			if ( isOneSwapSort(A) > 0 ) return 2; //more than one swap
	    		return 1; //one swap
	    	} 

ernestlv

function solution(Y, A, B, W) {
    // write your code in JavaScript (Node.js 8.9.4)
    const MONTH_DAYS = {
    	"January":31, "February":28, "March":31, "April":30, "May":31, "June":30, "July":31, "August":31, "September":30, "October":31, "November":30, "December":31
    };
    const MONTHS = {
    	"January":0, "February":1, "March":2, "April":3, "May":4, "June":5, "July":6, "August":7, "September":8, "October":9, "November":10, "December":11
    };

    function findFirstVacationMonday(year, month) {

ernestlv

const http = require('http')
const httpS = require('https')
const Router = require('router')

const port = process.env.PORT || 3000

const router = Router()

router.get('/', (req, res) => {
	res.write('REST API is up!');

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/* converts an array of the form [ { key, value } ] to a map of the form { key:value } */
const arr = [{key:"123", value:"abc"}, {key:"456", value:"def"}, {key:"789", value:"ghi"}];
const map = arr.reduce((res, o) => ({ ...res, [o.key]:o }), {});

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/* it is in A but not in B */
function diff(arrA, arrB) {
  const mapB = arrB.reduce((res, b) => ({ ...res, [b.key]:b }), {});
  return arrA.reduce((res, a) => !(a.key in mapB) ? [ ...res, a ] : res, []);
}