Run results for: jQuery event On Performance with event set on each item

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.67 Safari/537.36

Browser: Chrome 70

Operating system: Windows

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
.each loop and single on-assignement	1142.2 Ops/sec
no loop and .on-assignement on list	1964.0 Ops/sec
assign event for each item	1817.8 Ops/sec

HTML Preparation code:

<script src="//ajax.googleapis.com/ajax/libs/jquery/2.2.4/jquery.min.js"></script>

<style>
  #container { visibility: hidden; }
</style>

<div id="container">
</div>

Script Preparation code:

var container = $('#container')
var itemCount = 500;

for (var i = 0; i < itemCount; i++) {
  container.append('<div>Item ' + i + '</div>');
}

var items = container.children();

Tests:

.each loop and single on-assignement
items.each(function(index,item) { var $item = $(item); $item.on('click', function() { console.log('Item clicked'); }); });
no loop and .on-assignement on list
items.on('click', function() { console.log('Item clicked'); });
assign event for each item
items.click(function() { console.log('Item clicked'); });

Run results for: jQuery event On Performance with event set on each item

.each loop and single on-assignement

no loop and .on-assignement on list

assign event for each item