Run results for: delete vs undefined vs null - 4

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.121 Safari/537.36

Browser: Chrome 85

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 4 years ago

Script Preparation code:

test = {
    test: [
    ]
}

for(let i = 0; i < 500; i++){
  test.test[i] = {hello: {msg: 'your mom'}}
}

​x
 
test = {    test: [    ]}​for(let i = 0; i < 500; i++){  test.test[i] = {hello: {msg: 'your mom'}}}

Tests:

delete
test.test.forEach(hello => delete hello.msg)
test.test.forEach(hello => delete hello.msg)
undefined
test.test.forEach(hello => hello.msg = undefined)
test.test.forEach(hello => hello.msg = undefined)

test.test.forEach(hello => hello.msg = null)

 
test.test.forEach(hello => hello.msg = null)