Run results for: return : undefined vs. typeof vs. in vs. hasOwnProperty vs try catch - MeasureThat.net

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/95.0.4638.54 Safari/537.36

Browser: Chrome 95

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
undefined	2644015.0 Ops/sec
typeof	5024911.0 Ops/sec
in	4914706.0 Ops/sec
hasOwnProperty	4733199.0 Ops/sec
bool	4988595.0 Ops/sec
try catch	9743474.0 Ops/sec

Website performance monitoring

Script Preparation code:

var obj = { a: 1, b: 2, c: 3, d: 4, e: 5 };

Tests:

undefined
return undefined !== obj.d ? obj.d : undefined;
typeof
return 'undefined' !== typeof obj.d ? obj.d : undefined;
in
return 'd' in obj ? obj.d : undefined;
hasOwnProperty
return obj.hasOwnProperty( 'd' ) ? obj.d : undefined;
bool
return !! obj.d ? obj.d : undefined;
try catch
try { return obj.d } catch { return undefined };