<div id="container"></div>
var elements = [document.createElement('div'), document.createElement('div')];
var fragment = document.createDocumentFragment();
var container = document.getElementById('container');
elements.forEach(element => fragment.appendChild(element));
container.appendChild(fragment);
var changeIndex = 1;
elements[changeIndex] = document.createElement('div');
var newChildren = document.createDocumentFragment();
elements.forEach(element => newChildren.appendChild(element));
container.replaceChild(elements[changeIndex], container.children[changeIndex]);
var changeIndex = 1;
elements[changeIndex] = document.createElement('div');
var newChildren = document.createDocumentFragment();
elements.forEach(element => newChildren.appendChild(element));
container.replaceChildren(elements)
var changeIndex = 1;
elements[changeIndex] = document.createElement('div');
var newChildren = document.createDocumentFragment();
elements.forEach(element => newChildren.appendChild(element));
container.replaceChildren(newChildren)
--enable-precise-memory-info
flag.
Test case name | Result |
---|---|
replaceChild | |
replaceChildren | |
append documentFragment |
Test name | Executions per second |
---|---|
replaceChild | 0.0 Ops/sec |
replaceChildren | 955865.7 Ops/sec |
append documentFragment | 1179523.6 Ops/sec |
I'll break down the provided benchmarking test cases and explain what's being tested, compared, and their pros and cons.
Benchmark Overview
The test case measures the performance of three different approaches to replace or append child elements to an HTML container element in JavaScript:
replaceChild
replaceChildren
DocumentFragment
Script Preparation Code
var elements = [document.createElement('div'), document.createElement('div')];
var fragment = document.createDocumentFragment();
var container = document.getElementById('container');
elements.forEach(element => fragment.appendChild(element));
container.appendChild(fragment);
This code creates two new div
elements, appends them to a DocumentFragment
, and then appends the fragment to the target container element.
Html Preparation Code
<div id="container"></div>
A basic HTML container element is created with an ID of "container".
Individual Test Cases
Each test case measures the performance of one specific approach:
replaceChild
var changeIndex = 1;
elements[changeIndex] = document.createElement('div');
var newChildren = document.createDocumentFragment();
elements.forEach(element => newChildren.appendChild(element));
container.replaceChild(elements[changeIndex], container.children[changeIndex]);
This approach uses replaceChild
to replace the child element at the specified index with a new one.
replaceChildren
var changeIndex = 1;
elements[changeIndex] = document.createElement('div');
var newChildren = document.createDocumentFragment();
elements.forEach(element => newChildren.appendChild(element));
container.replaceChildren(elements);
This approach uses replaceChildren
to replace all child elements with a new one.
DocumentFragment
var changeIndex = 1;
elements[changeIndex] = document.createElement('div');
var newChildren = document.createDocumentFragment();
elements.forEach(element => newChildren.appendChild(element));
container.replaceChildren(newChildren);
This approach uses a DocumentFragment
to create a new container and replaces the original children with the fragment.
Comparison
The benchmark tests the performance of each approach, comparing their execution times. The results show that:
DocumentFragment
(append documentFragment
) is the fastest approach.replaceChildren
has the next best performance.replaceChild
has the slowest performance, likely due to its more complex implementation.Pros and Cons
replaceChild
replaceChildren
, but can be slower for large datasets.replaceChildren
replaceChild
.replaceChild
and may not be suitable for all scenarios (e.g., when replacing individual elements).DocumentFragment
Other Considerations
When deciding which approach to use, consider factors such as:
Keep in mind that these benchmarks are specific to the provided test case and may not be representative of all scenarios.