Benchmark: Array.prototype.concat vs spread operator (b)

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

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36

Browser/OS: Chrome 120 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Array.prototype.concat	8846934.0 Ops/sec
spread operator	36172300.0 Ops/sec

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

LLMs can make mistakes. Check important info.

I'll break down the benchmark and explain what's being tested, compared, and the pros and cons of different approaches.

**Benchmark Overview**

The MeasureThat.net benchmark is designed to compare two approaches for concatenating arrays in JavaScript: the traditional `Array.prototype.concat()` method and the new ES6 spread operator (`...`).

**Test Cases**

There are two test cases:

1. **Array.prototype.concat**: This test case creates an array `params` with string values, a boolean value, and an integer value. It then concatenates this array to another array `[1, 2]` using the traditional `concat()` method.
2. **Spread Operator**: This test case is similar to the first one, but instead of using `concat()`, it uses the spread operator (`...`) to concatenate the two arrays.

**Options Compared**

The benchmark compares the performance of:

* Traditional `Array.prototype.concat()` method
* New ES6 spread operator (`...`)

**Pros and Cons of Different Approaches:**

* **Traditional `Array.prototype.concat()` method**:
	+ Pros: widely supported, well-documented, and easy to understand.
	+ Cons: can be slower due to the overhead of creating a new array and iterating over the original arrays.
* **New ES6 spread operator (`...`)**:
	+ Pros: faster, more concise, and expressive. It also avoids the need for explicit array creation and iteration.
	+ Cons: not as widely supported (older browsers may not support it), and its behavior can be unexpected if not used correctly.

**Library Usage**

None of the test cases uses any external libraries or frameworks.

**Special JS Feature/Syntax**

The benchmark leverages the new ES6 spread operator (`...`) feature, which was introduced in ECMAScript 2015. This syntax allows for spreading array elements into a new array, making it easier to concatenate arrays and create new arrays with a subset of existing values.

**Other Alternatives**

Other alternatives for concatenating arrays could include:

* Using `Array.prototype.push()` or `Array.prototype.splice()` methods
* Utilizing libraries like Lodash or Ramda, which provide more functional programming constructs for array manipulation
* Using other spread operator variants (e.g., `Array.prototype.unshift()`, `Array.prototype.splice()`)

Keep in mind that the choice of approach depends on the specific use case and performance requirements.

**Benchmark Preparation Code**

The provided script preparation code is empty, indicating that MeasureThat.net will generate this code automatically for each test case.

Related benchmarks:

Array.prototype.concat vs spread operator (b) (version: 0)

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

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

Created: 2 years ago by: Guest

Jump to the latest result

Array.prototype.concat

spread operator

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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