Run results for: Delete vs set undefined

Run details:

User agent: Mozilla/5.0 (Android 11; Mobile; rv:134.0) Gecko/134.0 Firefox/134.0

Browser: Firefox Mobile 134

Operating system: Android

Device Platform: Mobile

Date tested: one year ago

Set undefined

61.6M/s

Delete

4.6M/s

View exact numbers

Test name	Executions per second
✓ Set undefined	61,565,012 Ops/sec
Delete	4,557,559 Ops/sec

Script Preparation code:

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

Tests:

Delete
delete obj.a; delete obj.b; delete obj.c; delete obj.d;
Set undefined
obj.a = undefined; obj.b = undefined; obj.c = undefined; obj.d = undefined;