[рони]

klifort,

var quality = 27;

function portfolioBlock() {
  var divs = $(".ih-item");
  for(var i = 0; i < divs.length; i+=quality) {
    divs.slice(i, i+quality).wrapAll("<div class='new1'></div>");
  }
  var newBl = $(".new1");
  var new1 = new Array;
  newBl.each( function( index, el) {
    blockPort(el);
  });
  console.log(newBl);
};

function blockPort(el) {
  var arrDiv = $('.ih-item', el);
    arrDiv[0].classList.add("first");
    arrDiv[14].classList.add("second");
    arrDiv[26].classList.add("next");
  console.log(arrDiv);
 }