Mikhail Osher

// TOOLTIP PLUGIN DEFINITION
  // =========================

  function Plugin(option) {
    return this.each(function () {
      var $this   = $(this)
      var data    = $this.data('bs.tooltip')
      var options = typeof option == 'object' && option

      if (!data && /destroy|hide/.test(option)) return
      if (!data) $this.data('bs.tooltip', (data = new Tooltip(this, options)))
      if (typeof option == 'string') data[option]()
    })
  }

  var old = $.fn.tooltip

  $.fn.tooltip             = Plugin
  $.fn.tooltip.Constructor = Tooltip

var arr1 = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h'];
var arr2 = [1, 2, 3, 4, 5, 6, 7, 8];
var arr3 = [];

arr1.forEach(function(value, index) {
  arr3.push(value);
  
  if (index % 2 == 1) {
    arr3.push(arr2.shift()); // Изменяет arr2!
  }
});

console.log(arr3);

site.get_discount_price(discount_id).done(function(data) {
  var discr_price = data.summa_vozvrata;
  console.log(discr_price);
});

// EDIT

site.get_discount_price = function(discount_id) {
    var result;
    
    jQuery.ajax({
        url: '/test.php/' + discount_id + '.json',
        dataType: 'json',
        async: false,
        success: function (data) {
            result = data.summa_vozvrata;
        }
    });
    
    return result;
}

<link rel="search" type="application/opensearchdescription+xml" href="http://www.aliexpress.com/plugins/opensearch/opensearch.xml" title="Aliexpress Shopping" />

var getter = $parse('user.name');
var setter = getter.assign;
var context = {user:{name:'angular'}};
var locals = {user:{name:'local'}};

expect(getter(context)).toEqual('angular');
setter(context, 'newValue');
expect(context.user.name).toEqual('newValue');
expect(getter(context, locals)).toEqual('local');