Benchmark: undefined checks on property in if condition

Script Preparation code:

var obj = {a: 1, b: "b", c: undefined};

Tests:

implicit boolean conversion
if (obj.c) { console.log(obj.c); }
explicit boolean conversion
if (!!obj.c) { console.log(obj.c); }
triple inequality against undefined
if (obj.c !== undefined) { console.log(obj.c); }
typeof
if (typeof obj.c !== "undefined") { console.log(obj.c); }

Rendered benchmark preparation results:

Previous results

Test case name	Result
implicit boolean conversion
explicit boolean conversion
triple inequality against undefined
typeof

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Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_6) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.1.1 Safari/605.1.15

Browser/OS: Safari 13 on Mac OS X 10.14.6

Test name	Executions per second
implicit boolean conversion	8631457.0 Ops/sec
explicit boolean conversion	8323123.0 Ops/sec
triple inequality against undefined	2874510.0 Ops/sec
typeof	8740676.0 Ops/sec

undefined checks on property in if condition (version: 0)