Something like what JQuery does

jquery-ish.js

console.clear();
var $ = function(selector) {
  var list = document.querySelectorAll(selector)
  var each = function(callback) {
    return function() {
      for(var a = 0; a != list.length; a++) {
        var obj = list[a];
        callback.apply(obj,arguments);
      }
      return list;
    }
  }
  
  list.show = each(function(){
    this.style.display = '';
  });
  
  list.hide = each(function(){
    this.style.display = 'none';
  });
  
  list.bg = each(function(color){
    this.style.backgroundColor = color || 'red';
  })
  return list;
}


$('pre').bg('blue').hide().show().bg('yellow');