example.js

var is = Array.isArray;
var print = function print(func) {
  var str;
  var key;
  
  str = '[' + typeof func + ']';
  str += ' { \n';
  for (key in func) {
    str += '  ' + key + ': ' + String(func[key]) + '\n';
  }
  str += '  length: ' + func.length + '\n';
  return str + '}';
};
var get = function getProto(obj) {
  return obj.__proto__;
};
var log = console.log;

var obj = get(Object);
var arr = get(Array);

log('PROTOTYPES\n');

log('Object.prototype => ', print(obj));
log('Array.prototype  => ', print(arr));
log('');

log('(obj === arr) => ', obj === arr);
log('');

log('ARRAYS\n');

arr = new Array(5);
arr.diffKey = 'value';
arr[10] = null;
arr[5] = function example(){};
arr[6] = /regex/g;
arr.length = 15;

log('isArray(arr) => ', is(arr));
log('arr          => ', print(arr));
log('slice(arr)   => ', print(arr.slice(0)));