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

Run details:

User agent: Mozilla/5.0 (iPhone; CPU OS 13_7 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) FxiOS/28.1 Mobile/15E148 Safari/605.1.15

Browser: Mobile Safari 13

Operating system: iOS 13.7

Device Platform: Mobile

Date tested: 3 years ago

Test name	Executions per second
undefined	593536.8 Ops/sec
typeof	2067014.0 Ops/sec
in	2145167.0 Ops/sec
hasOwnProperty	2118601.0 Ops/sec
bool	2122300.0 Ops/sec
try catch	4029300.0 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 };