MeasureThat.net

Run results for: Delete vs set undefined Properties

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Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:104.0) Gecko/20100101 Firefox/104.0
Firefox 104
Windows
Desktop
2 years ago
Test name Executions per second
Deleted 17692076.0 Ops/sec
Set undefined 5162305.5 Ops/sec
Iterate deleted 115074440.0 Ops/sec
Iterate set undefined 44894736.0 Ops/sec
Script Preparation code:
​x
 
var objA = {a:1, b:2, c:3, d:4};
var objB = {a:1, b:2, c:3, d:4};
delete objA.a;
delete objA.b;
delete objA.c;
delete objA.d;
objB.a = undefined;
objB.b = undefined;
objB.c = undefined;
objB.d = undefined;
​
function doNothing(objin){}
Tests:

  • Deleted

     
    Object.entries(objA);

  • Set undefined

     
    Object.entries(objB);

  • Iterate deleted

     
    for(let a in objA) doNothing(a)

  • Iterate set undefined

     
    for(let b in objB) doNothing(b)