Benchmark: adding to array performance

Tests:

Concat
const testArray = [1, 2, 3]; const newTestArray = testArray.concat(4);
Spread
const testArray = [1, 2, 3]; const newTestArray = [...testArray, 4];

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
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):

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

**Benchmark Definition**

The benchmark is focused on measuring the performance of adding elements to an array in JavaScript. The two specific test cases are:

1. **Concat**: Using the `concat()` method to add a new element to the end of the array.
2. **Spread**: Using the spread operator (`...`) to create a new array with the original elements and the new element added.

**Options Compared**

The benchmark is comparing the performance of two approaches:

1. **Concat**: The traditional way of adding elements to an array using the `concat()` method.
2. **Spread**: A modern alternative that uses the spread operator (`...`) to create a new array with the original elements and the new element added.

**Pros and Cons**

Here's a brief summary of the pros and cons of each approach:

1. **Concat**:
	* Pros: Widely supported, easy to understand, and compatible with older browsers.
	* Cons: Can be slower due to the creation of a new array object, which can lead to garbage collection overhead.
2. **Spread**:
	* Pros: Faster performance, more efficient memory usage, and better support for modern browsers.
	* Cons: Less widely supported (older browsers might not understand the spread operator), and its syntax can be unfamiliar to some developers.

**Library and Purpose**

There is no external library being used in this benchmark. The focus is solely on comparing the performance of two JavaScript syntaxes.

**Special JS Feature or Syntax**

The use of the spread operator (`...`) in the **Spread** test case introduces a modern JavaScript feature that's not widely supported in older browsers. This requires caution when running the benchmark across different browsers and devices.

**Other Alternatives**

For adding elements to an array, other alternatives might include:

1. `push()`: Adding an element to the end of the array using the `push()` method.
2. `splice()`: Modifying the array by adding a new element at a specific index using the `splice()` method.

However, these alternatives are not being tested in this benchmark, which focuses on comparing the performance of `concat` and `spread`.

I hope this explanation helps software engineers understand the benchmark's purpose, pros, and cons of each approach!

Related benchmarks:

adding to array performance (version: 0)

Comparing performance of: Concat vs Spread

Created: 5 years ago by: Guest

Jump to the latest result

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):