Benchmark: Concat vs Spread Push

Tests:

Concat
let list = ['hi', 'bye', 'rye', 'tie'] let second = ['something', 'else', 'goes', 'here'] list = list.concat(second)
Spread Push
let list = ['hi', 'bye', 'rye', 'tie'] let second = ['something', 'else', 'goes', 'here'] list.push(...second)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Concat
Spread Push

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 29 days ago):

LLMs can make mistakes. Check important info.

**Understanding the Benchmark**

The provided JSON represents a JavaScript benchmark test case created using MeasureThat.net. The purpose of this benchmark is to compare the performance of two approaches: concatenating arrays using the `concat()` method and spreading an array into another array using the spread operator (`...`).

**Options Compared**

In this benchmark, we have two options being compared:

1. **Concatenation**: This approach uses the `concat()` method to combine two arrays.
2. **Spread Operator**: This approach uses the spread operator (`...`) to spread an array into another array.

**Pros and Cons of Each Approach**

* **Concatenation**:
	+ Pros: Simple, well-established method for combining arrays.
	+ Cons: Creates a new array object, which can lead to memory allocation overhead and slower performance.
* **Spread Operator**:
	+ Pros: More concise and expressive way to combine arrays.
	+ Cons: Requires the spread operator (`...`) syntax, which may not be familiar to all developers.

**Library Used**

There is no explicit library mentioned in the benchmark, but we can assume that `concat()` and the spread operator are part of the built-in JavaScript standard library.

**Special JS Feature or Syntax**

The benchmark uses the **spread operator (`...`)** syntax, which was introduced in ECMAScript 2015 (ES6). The spread operator allows you to expand an array into individual elements or objects.

**Benchmark Preparation Code and Description**

The `Script Preparation Code` field is empty, suggesting that no custom initialization code is required for this benchmark. The `Html Preparation Code` field is also empty, indicating that no HTML-related setup is necessary for this test.

**Other Alternatives**

In addition to the two approaches being compared in this benchmark, other alternatives could include:

* Using the `push()` method with a single argument array (e.g., `list.push(...second)`)
* Using a library function like Lodash's `concat` or `assign` methods
* Using an array comprehension or map function (if supported by the JavaScript engine)

Keep in mind that these alternatives may not be relevant to this specific benchmark, as the focus is on comparing concatenation and spread operator approaches.

Latest run results:

Run details: (Test run date: 6 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36

Browser/OS: Chrome 67 on Windows

View result in a separate tab

Test name	Executions per second
Concat	3718036.5 Ops/sec
Spread Push	14610549.0 Ops/sec

Related benchmarks:

Concat vs Spread Push (version: 0)

Comparing performance of: Concat vs Spread Push

Created: 6 years ago by: Registered User

Jump to the latest result

Concat

Spread Push

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 29 days ago):