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()	652355.2 Ops/sec
== or contains()	1127872.0 Ops/sec
!!closest.length	326310.6 Ops/sec
== and parentNodes	2012857.4 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)
var isOrIn = function isOrIn(container, contained){
  var found = false;
  if(!container || !contained){
  }else if(contained===container){
   found=true;
  } else{
    var pointer = contained;
    var parent = pointer.parentNode;

    while(parent && pointer!==container){
      if(parent === container){
          found=true;
          break;
      }
      pointer = parent;
      parent = pointer.parentNode;
    }

  }
  return found;
}

Tests:

is() or contains()
var found = $body.is($innerOne) || $.contains($body[0],$innerOne[0]);
== or contains()
var body = $body[0]; var innerOne = $innerOne[0]; var found = body==innerOne || $.contains(body,innerOne);
!!closest.length
var found = !!$innerOne.closest($body).length;
== and parentNodes
var found = isOrIn($body[0],$innerOne[0]);

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. Make === or parentNodes a function call

is() or contains()

== or contains()

!!closest.length

== and parentNodes