Run results for: delete property of object vs create new object

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/114.0

Browser: Firefox 114

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
create new object	12421.0 Ops/sec
directly delete	8740.3 Ops/sec

Script Preparation code:

var obj = {}
for (let i = 0; i < 1000; i++) {
	obj[`test_${i}`] = `value_${i}`;
}

Tests:

create new object
const newObject = Object.keys(obj).reduce((object, key) => { if (key) { object[key] = obj[key] } return object }, {})
directly delete
const newObject = { ...obj }; Object.keys(newObject).forEach(key => { delete newObject[key]; });