Run results for: Delete vs set undefined

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:78.0) Gecko/20100101 Firefox/78.0

Browser: Firefox 78

Operating system: Mac OS X 10.11

Device Platform: Desktop

Date tested: 3 months ago

Set undefined

4.7M/s

Delete

1.7M/s

View exact numbers

Test name	Executions per second
✓ Set undefined	4,720,428 Ops/sec
Delete	1,714,054 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;