Benchmark: concat vs spread operator

Tests:

Array.prototype.concat
var params = [ "hello", true, 7 ]; var other = [ 1, 2 ].concat(params);
spread operator
var params = [ "hello", true, 7 ] var other = [ 1, 2, ...params ]

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.prototype.concat
spread operator

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 28 days ago):

LLMs can make mistakes. Check important info.

Let's break down the benchmark and its components.

**Benchmark Definition**

The benchmark compares the performance of two approaches: using the traditional `concat()` method versus the new ES6 spread operator (`...`).

**Options Compared**

1. **Array.prototype.concat()**: A built-in JavaScript method that concatenates two or more arrays.
2. **Spread Operator (`...`)**: A new syntax introduced in ES6 that allows you to expand an array into separate arguments.

**Pros and Cons of Each Approach**

* **Array.prototype.concat()**:
	+ Pros: Well-established, widely supported, and well-documented.
	+ Cons: Can be slower than the spread operator due to the overhead of function calls and argument creation.
* **Spread Operator (`...`)**:
	+ Pros: More concise and readable, especially for simple concatenations. Can also avoid creating intermediate arrays.
	+ Cons: Less widely supported (older browsers and Node.js versions may not support it) and might require more understanding of the syntax.

**Library Used**

None explicitly mentioned in the benchmark definition. However, both approaches rely on built-in JavaScript functions (`Array.prototype.concat()`).

**Special JS Feature or Syntax**

The spread operator (`...`) is a new syntax introduced in ES6. It allows you to expand an array into separate arguments when calling a function that expects multiple arguments.

**Other Considerations**

When choosing between `concat()` and the spread operator, consider the size of the arrays being concatenated, as larger arrays may benefit from the spread operator's avoidance of intermediate arrays.

**Alternatives**

If you need to compare performance with other concatenation methods or approaches (e.g., using `Array.prototype.reduce()`, `Array.prototype.push()`, or a custom implementation), these alternatives can be explored. However, for this specific benchmark, the focus is on comparing the spread operator and the traditional `concat()` method.

To prepare a new benchmark definition, you would need to:

1. Define your test cases (similar to the ones provided in the benchmark).
2. Specify a script preparation code that sets up the necessary variables and data.
3. Choose a benchmarking framework or tool (like MeasureThat.net) that can execute the tests and provide results.

Keep in mind that the spread operator is now widely supported across modern browsers and JavaScript environments, making it likely that this specific benchmark will favor the spread operator over `concat()`.

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Linux; Android 12; SM-G975F) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.0.0 Mobile Safari/537.36

Browser/OS: Chrome Mobile 103 on Android

View result in a separate tab

Test name	Executions per second
Array.prototype.concat	5691429.5 Ops/sec
spread operator	25992718.0 Ops/sec

Related benchmarks:

concat vs spread operator (version: 0)

Compare the new ES6 spread operator with the traditional concat() method

Comparing performance of: Array.prototype.concat vs spread operator

Created: 6 years ago by: Guest

Jump to the latest result

Array.prototype.concat

spread operator

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 28 days ago):