Benchmark: Concat vs push(...) for large arrays 4

Script Preparation code:

window.top.tests = {control:[], concat:[], spread:[]};
window.test = (new Array(5000)).fill(3);
window.cutoff = 500000;

Tests:

Control (for push)
window.top.tests.control.push.apply(window.top.tests.control, window.test); if (window.top.tests.control.length > window.cutoff) { window.top.tests.control = []; console.log('reset control'); }
Concat
window.top.tests.concat = window.top.tests.concat.concat(window.test); if (window.top.tests.concat.length > window.cutoff) { window.top.tests.concat = []; console.log('reset concat'); }
Spread
window.top.tests.spread.push(...window.test); if (window.top.tests.spread.length > window.cutoff) { window.top.tests.spread = []; console.log('reset spread'); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Control (for push)
Concat
Spread

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):

LLMs can make mistakes. Check important info.

**Benchmark Overview**

The provided benchmark, "Concat vs push(...) for large arrays 4", compares the performance of three different approaches to append elements to a large array:

1. **Control (for push)**: Using the `push` method with an array as its argument.
2. **Concat**: Using the `concat` method to concatenate the new array with the existing one.
3. **Spread**: Using the spread operator (`...`) to spread the new array's elements into the existing one.

**Options Comparison**

Here's a brief overview of each option:

* **Control (for push)**:
	+ Pros: Simple, intuitive syntax; efficient for small arrays.
	+ Cons: Can be slower than other methods for large arrays due to the overhead of creating an array and then appending elements to it.
* **Concat**:
	+ Pros: Generally faster than `push` for large arrays since it avoids the overhead of creating a new array, but may create multiple intermediate arrays.
	+ Cons: May not be as efficient as other methods when dealing with very large arrays or when the array needs to be modified in place.
* **Spread**:
	+ Pros: Often faster than `concat` and `push` for large arrays since it avoids creating intermediate arrays, but may have a slight overhead due to the syntax.
	+ Cons: May not work as expected if the existing array is also being pushed or spread into.

**Library and Special JS Features**

The benchmark uses the following library:

* None explicitly mentioned, but `push` and `concat` methods are built-in JavaScript methods.

There are no special JavaScript features used in this benchmark.

**Considerations**

When choosing an approach, consider the specific requirements of your use case. If you need to append elements to a large array frequently, using `push` might be suitable for small arrays but slower for larger ones. For very large arrays or when creating multiple intermediate arrays is not acceptable, `concat` or spread might be better options.

**Alternatives**

If you're looking for alternative approaches, consider:

* Using `splice` method to modify the array in place: `window.top.tests.control.splice(0, 0, ...window.test);`
* Using `Array.prototype.set` method (supported in modern browsers): `window.top.tests.control.set(window.test)`
* Using a third-party library or utility function for array manipulation.

Keep in mind that the choice of approach ultimately depends on your specific use case and performance requirements.

Related benchmarks:

Concat vs push(...) for large arrays 4 (version: 0)

Comparing the various ways to append to a large array

Comparing performance of: Control (for push) vs Concat vs Spread

Created: 4 years ago by: Guest

Jump to the latest result

Control (for push)

Concat

Spread

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):