Toggle navigation
MeasureThat.net
Create a benchmark
Tools
Feedback
FAQ
Register
Log In
Convert querySelectorAll to array -
(version: 0)
Comparing performance of:
Array.prototype.slice.call vs [].slice.call vs ...
Created:
5 years ago
by:
Registered User
Jump to the latest result
Script Preparation code:
maind = document.createElement('div'); for (let i = 0; i < 10000; i++) { let d = document.createElement('div'); maind.appendChild(d); } document.body.appendChild(maind);
Tests:
Array.prototype.slice.call
Array.prototype.slice.call( maind.querySelectorAll('div') );
[].slice.call
[].slice.call( maind.querySelectorAll('div') );
...
[...maind.querySelectorAll('div')]
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
Fork
Test case name
Result
Array.prototype.slice.call
[].slice.call
...
Fastest:
N/A
Slowest:
N/A
Latest run results:
No previous run results
This benchmark does not have any results yet. Be the first one
to run it!
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark and explain what's being tested. **Benchmark Definition** The benchmark is testing three different ways to convert the result of `querySelectorAll` method on an HTML element (`maind`) into an array. **Options Being Compared** 1. **Array.prototype.slice.call()**: This method creates a new array from an existing iterable (in this case, the result of `querySelectorAll`). The `call()` part is used to call the `slice()` function as a method on the Array prototype. 2. **[].slice.call()**: Similar to the previous option, but uses an arrow function (`[]`) instead of the `Array.prototype`. 3. **Spread operator (...)**: This method uses the spread operator to convert the result of `querySelectorAll` into an array. **Pros and Cons** * **Array.prototype.slice.call()**: + Pros: Widely supported, easy to understand. + Cons: May be slower due to the overhead of calling a function on the Array prototype. * **[].slice.call()**: + Pros: Can be faster than `Array.prototype.slice.call()` since it avoids the extra method call. + Cons: Requires arrow functions (introduced in ECMAScript 2015), which may not be supported by older browsers or environments. * **Spread operator (...)**: + Pros: Simple, modern syntax. Fast and efficient. + Cons: May not work in older browsers or environments that don't support the spread operator. **Library/Utility Used** None of these options rely on a specific library or utility beyond standard JavaScript features. **Special JS Feature/Syntax** The use of arrow functions (`[]`) in option 2 is an example of a modern JavaScript feature. Arrow functions were introduced in ECMAScript 2015 and provide a concise way to define small, single-expression functions. **Other Considerations** When testing performance-critical code like this benchmark, it's essential to consider factors such as: * Browser support: Ensure the test works across different browsers and versions. * Environment: Test on various environments (e.g., desktop, mobile) with different operating systems and hardware configurations. * Platform: Test on multiple platforms to ensure consistency. **Alternatives** Other alternatives for converting an iterable into an array include: * `Array.from()`: Introduced in ECMAScript 2015, this method creates a new array from an iterable. * `iterableToArray()` functions: Some libraries and frameworks provide custom `iterableToArray()` functions that can convert iterables to arrays. Keep in mind that the choice of alternative depends on the specific requirements and constraints of your project.
Related benchmarks:
Test47
Convert querySelectorAll to array + push
For, While
Spread vs Array.from on querySelectorAll
Comments
Confirm delete:
Do you really want to delete benchmark?