Run results for: Fastest way to check if object is empty2

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36 Edg/120.0.0.0

Browser: Chrome 120

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

object.keys()

3.8M/s

for in

3.7M/s

JSON.stringify()

1.3M/s

View exact numbers

Test name	Executions per second
✓ object.keys()	3,794,875 Ops/sec
for in	3,688,980 Ops/sec
JSON.stringify()	1,298,411 Ops/sec

Script Preparation code:

var xxx = {}
var yyy = {};
for (let i = 0; i < 10; ++i) {
  yyy[`key${i}`] = i;
}

function isEmpty(v) {
  for (const _ in xxx) { return false }
  return true;
}

Tests:

object.keys()
Object.keys(xxx) === 0 Object.keys(yyy) === 0
JSON.stringify()
JSON.stringify(xxx) === "{}" JSON.stringify(yyy) === "{}"
for in
isEmpty(xxx); isEmpty(yyy);

Run results for: Fastest way to check if object is empty2

You don't need to make add for loops in your test scenarios, the benchmark does it itself.

object.keys()

JSON.stringify()

for in