Run results for: JSON rw versus prototype

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.116 Safari/537.36

Browser: Chrome 53

Operating system: Mac OS X 10.10.5

Device Platform: Other

Date tested: 8 years ago

Test name	Executions per second
JSON rw	134600.4 Ops/sec
Prototype	1611371.9 Ops/sec

Script Preparation code:

var bigdata = {};
for (var i = 0; i < 100; i++) {
  var usdata = {
    name: 'user' + i,
    surname: 'user' + i,
    friends: {}
  };

  for (var j = 0; j < 10; j++) {
    usdata.friends['friend' + j] = {
      _ref: 'firend' + j
    };
  }

  bigdata['user' + i] = usdata;
}


function lazyExtend(prev, next) {
  if (!prev) return;
  for (var k in next) {
    var val = next[k];
    if (typeof(val) !== 'object') continue;
    lazyExtend(prev[k], val);
  }
  if (!next.toJSON) next.toJSON = jsonAll;
  Object.setPrototypeOf(next,prev);
}

function jsonAll() {
  var tmp = {};
  for(var key in this) {
    var to = typeof this[key];
    if(to !== 'function')
      tmp[key] = this[key];
  }
  return tmp;
}

Tests:

JSON rw
var copy = JSON.parse(JSON.stringify(bigdata.user0));
Prototype
var copy = {}; lazyExtend(bigdata.user0,copy);