Run results for: isOrIn alternatives

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.113 Safari/537.36

Browser: Chrome 60

Operating system: Windows

Device Platform: Other

Date tested: 7 years ago

Test name	Executions per second
is() or contains()	598321.6 Ops/sec
== or contains()	0.0 Ops/sec
!!closest.length	325614.9 Ops/sec
== and parentNodes	2093276.0 Ops/sec

HTML Preparation code:

<script type="text/javascript" src="http://ajax.aspnetcdn.com/ajax/jQuery/jquery-3.1.0.min.js"></script>

Script Preparation code:

//Add 100,000 elements
var frag = document.createDocumentFragment();
for (var i=0; i<10; i++){
  var outDiv = document.createElement('div');
  for (var j=0; j<100; j++){
    var midDiv = document.createElement('div');
    for (var k=0; k<100; k++){
      var inDiv = document.createElement('div');
      if(i==6 && j==60){
        if(k==60)
          inDiv.id="one";
        else if(k==61)
          inDiv.id="two";
      }
      midDiv.appendChild(inDiv)
    }
    outDiv.appendChild(midDiv)
  }
  frag.appendChild(outDiv);
}
document.body.appendChild(frag);
var $innerOne = $(document.getElementById('one'));
var $body = $(document.body)

Tests:

is() or contains()
var found = $body.is($innerOne) || $.contains($body[0],$innerOne[0]);
== or contains()
var body = $body[0]; var found = body==innerOne || $.contains(body,$innerOne[0]);
!!closest.length
var found = !!$innerOne.closest($body).length;
== and parentNodes
var found = false; var container = $body[0]; var contained = $innerOne[0]; if(contained===container){ found=true; } else if(container && contained){ var pointer = contained; var parent = pointer.parentNode; while(parent && pointer!==container){ if(parent === container){ found=true; break; } pointer = parent; parent = pointer.parentNode; } }

Run results for: isOrIn alternatives

Testing different methods of checking whether an element is or is in another element. Start from the position where you have jquery objects.

is() or contains()

== or contains()

!!closest.length

== and parentNodes