Benchmark: Array#concat vs spread operator

Tests:

concat
let arr = [1,2,3]; const newArr = arr.concat(4); console.log(newArr);
spread
let arr = [1,2,3]; const newArr = [...arr, 4]; console.log(newArr);

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 definition and test cases.

**Benchmark Definition**

The benchmark definition is represented by a JSON object, which contains information about the benchmark being tested. In this case, the benchmark defines two test cases:

1. `Array#concat vs spread operator`
2. The description of the benchmark is null, which means that the problem statement or context for the benchmark is not provided.

**Script Preparation Code**

The script preparation code is also represented by a JSON object, which contains no information in this case, just empty strings (`null`).

**Html Preparation Code**

Similarly, the html preparation code is also an empty string (`null`), indicating that no specific HTML setup or structure is required for running the benchmark.

**Individual Test Cases**

The test cases are represented by two separate JSON objects:

1. `concat`
```javascript
let arr = [1,2,3];
const newArr = arr.concat(4);
console.log(newArr);
```

This test case creates an array `arr` with initial values `[1, 2, 3]`, then uses the `concat()` method to add a new value `4` to the end of the array and assigns it to `newArr`. Finally, it logs the resulting array to the console using `console.log(newArr)`.

2. `spread`
```javascript
let arr = [1,2,3];
const newArr = [...arr, 4];
console.log(newArr);
```

This test case creates an array `arr` with initial values `[1, 2, 3]`, then uses the spread operator (`...`) to create a new array that includes all elements from `arr` and adds the value `4`. The resulting array is assigned to `newArr`, and its contents are logged to the console using `console.log(newArr)`.

**Library Usage**

There doesn't seem to be any explicit library usage in either test case. However, it's worth noting that modern JavaScript environments often rely on built-in functions or libraries like `Array.prototype.concat()` and `Array.prototype.push()`, which might influence performance characteristics.

**Special JS Features/Syntax**

The spread operator (`...`) is a relatively recent addition to the JavaScript language, introduced in ECMAScript 2015 (ES6). It allows creating new arrays by spreading the elements of an existing array. This feature was likely added to provide a more concise and expressive way to create new arrays.

**Other Alternatives**

In terms of alternatives for this benchmark, some possible scenarios include:

* Comparing performance with other array manipulation methods, such as `push()`, `splice()`, or `slice()`.
* Using different JavaScript engines (e.g., V8, SpiderMonkey) or versions to test compatibility and optimization.
* Running the benchmark on different platforms (e.g., Windows, macOS, Linux), devices (e.g., desktops, laptops, mobile devices), or browsers.
* Incorporating additional factors that might affect performance, such as array size, data types, or caching mechanisms.

Keep in mind that these alternatives would require modifying or extending the existing benchmark definition and test cases.

Related benchmarks:

Array#concat vs spread operator (version: 0)

Comparing performance of: concat vs spread

Created: 4 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):