<div id="container"></div>
const node = document.getElementById('container');
for(let i = 0; i < 10000; i++) {
node.appendChild(document.createElement('div'));
}
const node = document.getElementById('container');
const fragment = document.createDocumentFragment();
for(let i = 0; i < 10000; i++) {
fragment.appendChild(document.createElement('div'));
}
while (node.firstChild) {
node.removeChild(node.lastChild);
}
node.appendChild(fragment);
const node = document.getElementById('container');
const fragment = document.createDocumentFragment();
for(let i = 0; i < 10000; i++) {
fragment.appendChild(document.createElement('div'));
}
node.replaceChildren(fragment);
--enable-precise-memory-info
flag.
Test case name | Result |
---|---|
while w/ appendChild | |
replaceChildren |
Test name | Executions per second |
---|---|
while w/ appendChild | 118.0 Ops/sec |
replaceChildren | 141.7 Ops/sec |
I'd be happy to help explain the provided JavaScript benchmark.
Benchmark Overview
The provided benchmark measures the performance difference between two approaches: replaceChildren
and while
with appendChild
. The benchmark creates a container element, appends 10,000 div elements to it using appendChild
, and then removes all child nodes from the container using either replaceChildren
or a while
loop with appendChild
.
Options Compared
The two options being compared are:
replaceChildren
: This method replaces the entire contents of an element with new content. In this benchmark, it's used to replace the 10,000 div elements appended to the container.while
with appendChild
: This approach uses a loop to append child nodes to the container and then removes all child nodes using removeChild
.Pros and Cons
replaceChildren
:while
with appendChild
:Library Usage
Neither of the benchmark options uses any external libraries. The document.createDocumentFragment()
method is used to create a document fragment, which allows for efficient appending of elements without updating the entire DOM tree.
Special JS Feature/Syntax
None of the benchmark options use special JavaScript features or syntax that would affect performance. However, it's worth noting that the use of while
loops and appendChild
can be optimized using modern JavaScript features like for...of
loops and push()
methods.
Other Alternatives
Other approaches to appending elements without updating the DOM tree include:
MutationObserver
: This involves observing mutations to the container element and only updating its contents when changes are detected.Keep in mind that these alternatives may have different performance characteristics depending on the specific use case and browser support.