Ilya Loopashko

function doMagic(path) {
$.getJSON(path, function (data) {
    $(data).each(function(index, item) {
    $('#table').append(
        '<tr><td class="col1">'+ item.title01 +'</td><td class="col2">' + item.shopcode + '</td><td> <a href="' + item.link + '">' + item.title + '</a></td><td class="col3">' + item.cost + '</td></tr>'
        );
    });
});
}

doMagic('/js/db04.json')
doMagic('/js/db05.json')

// или
['/js/db04.json', '/js/db05.json', '/js/db06.json'].forEach(doMagic)

function getJsonAndUpdateTable(jsonPath) {
  $.getJSON(jsonPath, function (data) {
      $(data).each(function(index, item) {
      $('#table').append(
          '<tr><td class="col1">'+ item.title01 +'</td><td class="col2">' + item.shopcode + '</td><td> <a href="' + item.link + '">' + item.title + '</a></td><td class="col3">' + item.cost + '</td></tr>'
          );
      });
  });
}

var data = []
$('#txt-search').keyup(async function(){
            var searchField = $(this).val();
            if(searchField === '')  {
                $('#filter-records').html('');
                return;
            }

            if (!data.length) {
                data = await fetch('url/to/file.json').then(r => r.json())
            }

            var regex = new RegExp(searchField, "i");
            var output = '<div class="row">';
            var count = 1;
              $.each(data, function(key, val){
                if ((val.employee_salary.search(regex) != -1) || (val.employee_name.search(regex) != -1)) {
                  output += '<div class="col-md-6 well">';
                  output += '<div class="col-md-3"><img class="img-responsive" src="'+val.profile_image+'" alt="'+ val.employee_name +'" /></div>';
                  output += '<div class="col-md-7">';
                  output += '<h5>' + val.employee_name + '</h5>';
                  output += '<p>' + val.employee_salary + '</p>'
                  output += '</div>';
                  output += '</div>';
                  if(count%2 == 0){
                    output += '</div><div class="row">'
                  }
                  count++;
                }
              });
              output += '</div>';
              $('#filter-records').html(output);
        });

var dataPromise = fetch('url/to/file.json').then(r => r.json())

$('#txt-search').keyup(async function(){
            var searchField = $(this).val();
            if(searchField === '')  {
                $('#filter-records').html('');
                return;
            }

            const data = await dataPromise;

            var regex = new RegExp(searchField, "i");
            var output = '<div class="row">';
            var count = 1;
              $.each(data, function(key, val){
                if ((val.employee_salary.search(regex) != -1) || (val.employee_name.search(regex) != -1)) {
                  output += '<div class="col-md-6 well">';
                  output += '<div class="col-md-3"><img class="img-responsive" src="'+val.profile_image+'" alt="'+ val.employee_name +'" /></div>';
                  output += '<div class="col-md-7">';
                  output += '<h5>' + val.employee_name + '</h5>';
                  output += '<p>' + val.employee_salary + '</p>'
                  output += '</div>';
                  output += '</div>';
                  if(count%2 == 0){
                    output += '</div><div class="row">'
                  }
                  count++;
                }
              });
              output += '</div>';
              $('#filter-records').html(output);
        });

header nav ul li ul {
background: #f7f7f7;
}

var a = 1,x; // a = 1
x = 
++a // a = 2 
+ 
++a; // a = 3
// x = 5, x = 2 + 3
// a = 3, последняя операция ++a

x +=a; // x = 8, x = 5 + 3

console.log(x); //8

function getImage() {
  const random = Math.floor(Math.random() * 2);   
  return '<img src="img/'+random+'.png" border="0" />';
}

document.getElementById("imaaaga").innerHTML = getImage();
document.getElementById("imaaaga2").innerHTML = getImage();

sha = function(){
return Math.floor(Math.random() * 2);   
}

document.getElementById("imaaaga").innerHTML = '<img src="img/'+sha()+'.png" border="0" />';
document.getElementById("imaaaga2").innerHTML = '<img src="img/'+sha()+'.png" border="0" />';

var fs = require('fs');

var source = fs.readFileSync('./template.html', 'utf8');

var template = handlebars.compile(source);
var html = template(data);
console.log(html);

var fs = require('fs');

fs.readFile('./template.html', 'utf8', function(err, source) {
  var template = handlebars.compile(source);
  var html = template(data);
  console.log(html);
});

Если можете, приведите примеры использования данного метода, ну и конечно объясните мне мои вопросы, спасибо!

Function.prototype.method = function(name, func){
    this.prototype[name] = func;
    return this
};

function Person(name) {
  this.name = name
}

Person
  .method('say', function() {
    console.log('dude!')
  })
  .method('myName', function() {
    console.log(this.name)
  });

var person = new Person('Alex')

person.say() // dude!
person.myName() // Alex

const sums = arr.reduce((acc, n, i) => (
  (i & 1) || acc.push(0),
  acc[acc.length - 1] += n,
  acc
), []);

// или

const sums = arr.reduce(
  (acc, n, i) => (acc[i / 2 | 0] += n, acc),
  Array(Math.ceil(arr.length / 2)).fill(0)
);

// или

const sums = Array.from(
  { length: arr.length / 2 + arr.length % 2 },
  (n, i) => arr[i * 2] + (arr[i * 2 + 1] || 0)
);

// или

const sums = eval(`[${arr}]`.replace(/(\d+),(\d+)/g, '$1+$2'));

const result = sums.join(' ');

// или

const result = sums.reduce((acc, n) => acc + (acc && ' ') + n, '');

// или

const result = ''.concat(...sums.flatMap((n, i) => i ? [ ' ', n ] : n));

// или

const result = String(sums).replace(/,/g, ' ');