Run results for: in vs hasownproperty vs undefined

Run details:

User agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.113 Safari/537.36

Browser: Chrome 60

Operating system: Windows 7

Device Platform: Other

Date tested: 7 years ago

Script Preparation code:

var obj = {
  x: 1,
  y: 1
}

Tests:

in
var t; if("x" in obj){ t = true; }else{ t = false; } var t2; if("l" in obj){ t1 = true; }else{ t1 = false; }
hasOwnProperty
var t; if(obj.hasOwnProperty("x")){ t = true; }else{ t = false; } var t2; if(obj.hasOwnProperty("l")){ t1 = true; }else{ t1 = false; }
undefined obj
var t; if(obj["x"]){ t = true; }else{ t = false; } var t2; if(obj["l"]){ t1 = true; }else{ t1 = false; }