Benchmark: Array push vs concat vs push + flat

Tests:

Array.prototype.concat
const params = [ "hello", true, 7 ]; const other = [ 1, 2 ].concat(params);
push + flat
const items = []; const params = [ "hello", true, 7 ] items.push(params) const other = items.flat()
Push
const params = [ "hello", true, 7 ]; const other = [ 1, 2 ].push(...params);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.prototype.concat
push + flat
Push

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 7 minutes ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:130.0) Gecko/20100101 Firefox/130.0

Browser/OS: Firefox 130 on Windows

View result in a separate tab

Test name	Executions per second
Array.prototype.concat	12368398.0 Ops/sec
push + flat	8968817.0 Ops/sec
Push	13615646.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks.

**What is tested on the provided JSON?**

The provided JSON represents three benchmark test cases that compare the performance of different approaches for array manipulation in JavaScript:

1. **Array.prototype.concat**: This test case measures the performance of using the `concat()` method to concatenate an array with another array.
2. **push + flat**: This test case compares the performance of pushing an element onto an array and then flattening it, versus using the `flat()` method directly on the original array.
3. **Push**: This test case measures the raw performance of simply pushing elements onto an array without any additional operations.

**Options compared**

The three test cases compare different approaches to achieve a similar goal:

* Using `concat()`, which creates a new array by concatenating two arrays and returns it
* Using `push()` followed by `flat()`, which pushes elements onto the original array and then flattens it
* The raw `push()` approach, which simply adds elements to an existing array without any additional operations

**Pros and Cons of each approach**

Here's a brief analysis of each approach:

1. **Array.prototype.concat**
	* Pros: Creates a new array with the combined elements, which can be beneficial for array manipulation.
	* Cons: Creates a new array object, which incurs memory allocation overhead, and returns a new array, which may not be as efficient as modifying an existing array.
2. **Push + flat**
	* Pros: Modifies the original array by pushing elements onto it, which can be more efficient than creating a new array.
	* Cons: Requires two operations (pushing and flattening), which can increase overhead compared to a single operation like `concat()`.
3. **Push**
	* Pros: Simple and efficient approach that modifies an existing array directly.
	* Cons: May not be suitable for all scenarios, as it doesn't flatten the array into a single level.

**Library used**

There is no explicit library mentioned in the provided JSON, but if we consider the `flat()` method, it's likely using the built-in JavaScript `Array.prototype.flat()` method or possibly a third-party library like Lodash.

**Special JS feature or syntax**

None of the test cases explicitly use any special JavaScript features or syntax beyond standard JavaScript language constructs.

**Other considerations**

When running these benchmarks, you may want to consider factors such as:

* Array size: How large is the array being manipulated? Increasing the array size can significantly impact performance.
* Browser support: The benchmark results are from Chrome 129 on Windows Desktop. You may want to run the same test cases in other browsers and platforms to ensure cross-platform compatibility.
* Other overheads: Are there any additional operations or dependencies (e.g., DOM manipulation) that could affect the performance of these benchmarks?

**Alternatives**

Other approaches you might consider for array manipulation include:

1. **Array.prototype.reduce()**: Instead of using `push()` or `concat()`, you can use `reduce()` to concatenate arrays.
2. **Array.prototype spread operator (`...`)**: You can use the spread operator to create a new array from an existing one, which might be more efficient than `concat()`.
3. **Native libraries**: Depending on your specific requirements and performance-critical code paths, you may want to consider using native libraries like Node.js's built-in `array-prototype-flat` method or other third-party libraries for optimized array manipulation.

These alternatives can help you explore different optimization strategies for your specific use case.

Related benchmarks:

Array push vs concat vs push + flat (version: 0)

Comparing performance of: Array.prototype.concat vs push + flat vs Push

Created: 4 years ago by: Guest

Jump to the latest result

Array.prototype.concat

push + flat

Push

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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