Benchmark: querySelectorAll.forEach vs. Array.from(getElementsByClassName).forEach - remove(

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Tests:

querySelectorAll
document.querySelectorAll(".test").forEach(function (el) { el.remove() })
document.querySelectorAll(".test").forEach(function (el) { el.remove() })
getElementsByClassName
Array.from(document.getElementsByClassName(".test")).forEach(function (el) { el.remove() })
Array.from(document.getElementsByClassName(".test")).forEach(function (el) { el.remove() })

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Experimental features:

Memory measurements supported only in Chrome.
For precise memory measurements Chrome must be launched with --enable-precise-memory-info flag.
More information: Monitoring JavaScript Memory

Test case name	Result
querySelectorAll
getElementsByClassName

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.101 Safari/537.36

Browser/OS: Chrome 91 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
querySelectorAll	859996.1 Ops/sec
getElementsByClassName	1235914.4 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated 7 months ago):

I'll provide an explanation of the benchmark, its options, pros and cons, and other considerations.

Benchmark Definition

The benchmark compares two approaches to removing elements from a collection:

Using querySelectorAll with forEach
Using getElementsByClassName with forEach

Options

There are two options being compared:

A) querySelectorAll: This method returns an HTMLCollection of all elements that match the specified selector (in this case, .test). The forEach method is then used to iterate over the collection and remove each element.

B) getElementsByClassName: This method returns a NodeList of all elements whose class attribute matches the specified value (in this case, .test). The forEach method is then used to iterate over the NodeList and remove each element.

Pros and Cons

A) querySelectorAll:

Pros:

Faster execution time, as it only retrieves the elements once
Less memory usage, as it doesn't create an array of elements

Cons:

Requires the DOM to be parsed before using the method
May have performance issues if the collection is very large

B) getElementsByClassName:

Pros:

More reliable, as it doesn't rely on the DOM being parsed
Easier to use, as it returns a NodeList instead of an HTMLCollection

Cons:

Slower execution time, as it needs to iterate over each element in the NodeList
More memory usage, as it creates an array-like object with all elements

Other Considerations

The benchmark uses Chrome 91 on a Mac OS X 10.15.7 machine.
The remove() method is used to remove each element from the DOM, which can affect performance if not done correctly.
The benchmark doesn't account for other factors that could affect execution time, such as JavaScript engine optimizations or caching.

Library and Purpose

In this case, no specific library is used. However, some libraries like jQuery or Lodash might be used to simplify the comparison.

Special JS Feature or Syntax

There is no special JS feature or syntax being tested in this benchmark. The focus is on comparing two basic DOM manipulation methods.

Other alternatives to these methods include:

Using querySelector and then (for promises) to retrieve elements
Using Array.prototype.filter() and forEach() to remove elements from an array-like object
Using a library like jQuery or Lodash to simplify DOM manipulation

LLMs can make mistakes. Check important info.

I'll provide an explanation of the benchmark, its options, pros and cons, and other considerations.

**Benchmark Definition**

The benchmark compares two approaches to removing elements from a collection:

1. Using `querySelectorAll` with `forEach`
2. Using `getElementsByClassName` with `forEach`

**Options**

There are two options being compared:

A) `querySelectorAll`: This method returns an HTMLCollection of all elements that match the specified selector (in this case, `.test`). The `forEach` method is then used to iterate over the collection and remove each element.

B) `getElementsByClassName`: This method returns a NodeList of all elements whose class attribute matches the specified value (in this case, `.test`). The `forEach` method is then used to iterate over the NodeList and remove each element.

**Pros and Cons**

A) `querySelectorAll`:

Pros:

* Faster execution time, as it only retrieves the elements once
* Less memory usage, as it doesn't create an array of elements

Cons:

* Requires the DOM to be parsed before using the method
* May have performance issues if the collection is very large

B) `getElementsByClassName`:

Pros:

* More reliable, as it doesn't rely on the DOM being parsed
* Easier to use, as it returns a NodeList instead of an HTMLCollection

Cons:

* Slower execution time, as it needs to iterate over each element in the NodeList
* More memory usage, as it creates an array-like object with all elements

**Other Considerations**

* The benchmark uses Chrome 91 on a Mac OS X 10.15.7 machine.
* The `remove()` method is used to remove each element from the DOM, which can affect performance if not done correctly.
* The benchmark doesn't account for other factors that could affect execution time, such as JavaScript engine optimizations or caching.

**Library and Purpose**

In this case, no specific library is used. However, some libraries like jQuery or Lodash might be used to simplify the comparison.

**Special JS Feature or Syntax**

There is no special JS feature or syntax being tested in this benchmark. The focus is on comparing two basic DOM manipulation methods.

Other alternatives to these methods include:

* Using `querySelector` and `then` (for promises) to retrieve elements
* Using `Array.prototype.filter()` and `forEach()` to remove elements from an array-like object
* Using a library like jQuery or Lodash to simplify DOM manipulation

Related benchmarks:

querySelectorAll.forEach vs. Array.from(getElementsByClassName).forEach - remove( (version: 0)

Comparing performance of: querySelectorAll vs getElementsByClassName

Created: 3 years ago by: Registered User

Jump to the latest result

querySelectorAll

getElementsByClassName

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 7 months ago):