Run results for: hasOwnProperty vs index/undefined

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.132 Safari/537.36

Browser: Chrome 63

Operating system: Mac OS X 10.13.3

Device Platform: Other

Date tested: 2024 years ago

Test name	Executions per second
hasOwnProperty successfully, first entry	9709318.0 Ops/sec
hasOwnProperty unsuccessfully	9767429.0 Ops/sec
index/undefined successfully, first entry	3424155.0 Ops/sec
index/undefined unsuccessfully	3401654.0 Ops/sec
hasOwnProperty successfully, last entry	9909292.0 Ops/sec
index/undefined successfully, last entry	3425053.0 Ops/sec

Script Preparation code:

var entries = {
  a: 1,
  b: 2,
  c: 3,
  d: 4,
  e: 5
}

Tests: