Benchmark: gmoney - Concat vs push(...) for large arrays

Script Preparation code:

window.top.tests = {control:[], concat:[], spread:(new Array(10)).fill(null)};
window.test = (new Array(10)).fill(null);
window.cutoff = 5000;

Tests:

Control (for push)
for (let element of window.test) window.top.tests.control.push(element); 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 = [...window.top.tests.spread, ...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

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what's being tested, compared, and other considerations.

**Benchmark Definition**

The benchmark is defined in two parts: script preparation code and HTML preparation code. The script preparation code sets up an object `window.top.tests` with three arrays: `control`, `concat`, and `spread`. It also creates a large array `window.test` and defines a cutoff value of 5000.

**Test Cases**

There are three test cases:

1. **Control (for push)**: This test case appends elements from the `window.test` array to the `window.top.tests.control` array using the `push()` method.
2. **Concat**: This test case concatenates the `window.test` array to the `window.top.tests.concat` array using the spread operator (`concat` is likely a typo, and it should be `concat` instead of `concat.concat`).
3. **Spread**: This test case spreads the elements of the `window.test` array onto the `window.top.tests.spread` array.

**Comparison**

The benchmark compares the performance of these three approaches:

* Push vs Concat (Control): Using `push()` to append elements to an array versus using the spread operator (`concat`) to concatenate arrays.
* Control vs Spread: Using `push()` to append elements to an array versus spreading elements onto another array using the spread operator.

**Pros and Cons**

1. **Push vs Concat**:
	* Pros:
		+ Push is a more straightforward and efficient way to append elements to an array, especially for large arrays.
		+ It's often faster than concatenation.
	* Cons:
		+ The resulting array may not be as flexible or easily manipulable as one created with the spread operator.
2. **Control vs Spread**:
	* Pros:
		+ The spread operator can create a new array with a specific structure, which can be more efficient than pushing elements onto an existing array.
		+ It's often faster than using `push()` for large arrays.
	* Cons:
		+ The resulting array may not be as flexible or easily manipulable as one created with the `push()` method.

**Library and Special JS Features**

There are no specific libraries used in this benchmark. However, note that the spread operator (`...`) is a JavaScript feature introduced in ECMAScript 2015 (ES6). It's widely supported across modern browsers.

**Other Considerations**

* Memory allocation: The benchmark may be sensitive to memory allocation issues, especially when dealing with large arrays.
* Garbage collection: The performance of the benchmark may also depend on the garbage collector's behavior and frequency in the target browser.
* Browser differences: Results may vary across different browsers due to their implementation of array operations.

**Alternatives**

If you're interested in exploring alternative approaches or optimizing this benchmark, consider:

* Using `Array.prototype.unshift()` instead of `push()` for appending elements at the beginning of an array.
* Comparing the performance of other array concatenation methods, such as using a loop to append elements.
* Investigating the impact of specific browser settings, like enabling or disabling just-in-time (JIT) compilation.

Related benchmarks:

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

Comparing the various ways to append to a large array

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

Created: 2 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):