<div id="parent">
<div id="child">
Child
</div>
</div>
<script src='https://cdnjs.cloudflare.com/ajax/libs/jquery/3.4.1/jquery.js'></script>
var $parent = $("#parent");
$("#child");
$parent.find("#child");
document.getElementById("child");
--enable-precise-memory-info
flag.
Test case name | Result |
---|---|
$("#child") | |
$parent.find("#child") | |
document.getElementById("child") |
Test name | Executions per second |
---|---|
$("#child") | 518295.6 Ops/sec |
$parent.find("#child") | 293703.2 Ops/sec |
document.getElementById("child") | 1767809.4 Ops/sec |
Let's dive into the explanation of the provided benchmark.
Benchmark Overview
The benchmark is designed to compare three approaches for finding an element by its ID using JavaScript: document.getElementById()
, jQuery's $()
function, and find()
method from the $
object (which appears to be a custom library).
Library Used: jQuery
The test case uses jQuery, which is a popular JavaScript library used for DOM manipulation and event handling. The library provides a convenient way to interact with the Document Object Model (DOM) of web pages.
In the provided benchmark, jQuery is used to select elements by their IDs using the $()
function. This function takes an ID as an argument and returns the element with that ID or null
if no such element exists.
Options Compared
The three options compared in the benchmark are:
document.getElementById("child")
: This method uses the built-in ElementById()
function to find an element by its ID.$("#child")
: This method uses jQuery's $()
function to select an element by its ID.$parent.find("#child")
: This method uses the find()
method from the $
object (which appears to be a custom library) to find an element by its ID.Pros and Cons of Each Approach
document.getElementById("child")
:$("#child")
: (jQuery).css()
and .html()
.$parent.find("#child")
:$
object library, which may add overhead to the application.Special JS Feature/Syntax
None of these options use special JavaScript features or syntax. They are all standard JavaScript methods or functions.
Other Alternatives
If you don't have access to jQuery, you could also consider using other libraries like React or Angular for DOM manipulation and event handling. Alternatively, you could implement your own custom library for finding elements by ID using a loop or recursion.
Keep in mind that the performance differences between these approaches may not be significant for most use cases, but they can add up when dealing with large datasets or complex applications.