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classDiagram
    class DataLayer{
        +Map<key:String, AbstractDataSet> DataSet
        
    }

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function sum(a: number, b: number): number {
  return a + b;
}
function ded(a: number, b: number): string {
  return (a * b).toFixed(2);
}

type CF = (...args: any[]) => any;

type LastFnReturnType<T extends any[]> = ReturnType<T[0]>;

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// recursive
function tick(cnt = 0, duration=1000, callback:(cnt:number)=>void ){
    if(cnt <= 0) return;
    setTimeout(() => {
        callback(cnt);
        tick(--cnt, duration, callback);
    }, duration);
}

// async

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function ampm224(s) {
    const ampm = s.substr(-2) === 'PM';
    const [hh, mm, ss] = s.split(':').map(x => parseInt(x, 10) );
    const HH = ampm ? hh%12 + 12 : hh%12
    return [HH, mm, ss]
      .map( x => x.toString().padStart(2, '0') )
      .join(':')
}
//['12:00:00AM','12:00:00PM','07:10:00PM'].map( timeConversion ) 
//["00:00:00", "12:00:00", "19:10:00"] 

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function HammingDistance(a, b){
  var HD = 0;
  var n = (a ^ b);
  // console.log(a.toString(2));
  // console.log(b.toString(2));
  // console.log(n.toString(2));
  while(n){
   HD = HD + n % 2;
   n = n >> 1;
  }

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/*
  Sort array and set items from def at the beginning
  WORKS CORRECTLY FOR UNIQ ARRAYS ONLY!
*/

const x = ['a','s','d','f','g','j','h','k','p']; // desired order
const y = ['a','h','f','y','d','q','p','k']; // what we have


const z1 = y.concat().sort( (a,b) => x.indexOf(a) - x.indexOf(b));

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for (var i = 0; i < 10; i++) {
            
            var element = document.createElement('button');
            element.innerHTML = '#' + i;
            document.body.appendChild(element);
            
            element.onclick  = function(){
                console.log(i);
            }
        }

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           boolSort: function(a, b, dt, sign){
                return (!!a^0 - !!b^0) * sign;
            },

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var fontSZ = '14px'

var nl = document.querySelectorAll('*');
var szs = {};
for(var i = 0; i < nl.length; i++){
  var tagName = nl.item(i).tagName;
  if( (tagName !='SCRIPT') && (tagName != 'LINK') && (tagName != 'STYLE') ){
    var sz =  window.getComputedStyle(nl.item(i))['fontSize'];
  
    if(sz === fontSZ){

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function flatten(a){
   return a.reduce(function(p, c){ 
       if(Array.isArray(c)) {
          return p.concat(flattern(c));
       } else {
          return p.concat(c);
       }      
   }, []);
}