Run results for: in vs hasownproperty vs undefined

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.1 Safari/605.1.15

Browser: Safari 13

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year 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; }