Benchmark: Array.prototype.concat vs spread operator

Tests:

Spread
let params = [ "hello", true, 7 ] params = [...params, 2]
Push
var params = [ "hello", true, 7 ] params.push(2)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Spread
Push

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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I'll break down the explanation into smaller sections to make it easier to understand.

**Benchmark Definition**

The benchmark is defined in JSON format, which represents a comparison between two approaches:

1. `Array.prototype.concat()`
2. The new ES6 spread operator (`...`)

The benchmark is comparing these two methods for creating a new array by spreading an existing array and adding a new element to it.

**Options Compared**

Two options are being compared:

* **`concat()` method**: This is the traditional way of concatenating arrays in JavaScript.
* **Spread operator (`...`)**: The new ES6 spread operator is used to create a new array by spreading an existing array and adding elements to it.

**Pros and Cons**

Here's a brief overview of each approach:

1. `concat()` method:
	* Pros: More explicit and easy to read, especially for developers familiar with the method.
	* Cons: Can be slower than the spread operator due to its dynamic behavior.
2. Spread operator (`...`):
	* Pros: Fast, concise, and readable.
	* Cons: Less intuitive for some developers, as it relies on understanding of array methods.

**Library Usage**

There is no explicit library usage mentioned in the benchmark definition or test cases. However, the `concat()` method uses the `Array.prototype.concat()` function from JavaScript's built-in object.

**Special JS Feature/Syntax**

No special JavaScript feature or syntax is used in these tests.

**Other Alternatives**

If you want to compare other approaches for array concatenation, here are some alternatives:

1. Using `Array.prototype.push()` with a single argument: `params.push(2)`. This method is less efficient than the spread operator.
2. Using `Array.prototype.push.apply()`: This method is similar to using `push()` but takes an array as an argument instead of a single value.
3. Using a library like Lodash, which provides a `concat` function: `_.concat(params, [2])`. However, this would add additional dependencies and potential overhead.

**Benchmark Preparation Code**

The benchmark preparation code is not provided in the original JSON data, but it's likely that a script is generating the test cases and executing them using JavaScript. The script might look something like this:
```javascript
function createTestCases() {
  const params = ['hello', true, 7];

// Create spread operator test case
  const spreadTestCase = [...params, 2];
  return { BenchmarkDefinition: `let params = [ ${JSON.stringify(params)} ];\nparams = [...params, 2]`, TestName: 'Spread' };

// Create push method test case
  const pushTestCase = {
    var: true,
    params: ['hello', true, 7]
  };
  return { BenchmarkDefinition: `var params = [ ${JSON.stringify(params)} ];\nparams.push(2)`, TestName: 'Push' };
}
```
This is just an example and actual implementation might vary.

**Latest Benchmark Result**

The latest benchmark result shows the performance of each test case using Chrome 65 on a Linux device:

* **`Push`**: 16451967.0 executions per second
* **`Spread`**: 2867036.25 executions per second

These results suggest that the spread operator is significantly faster than the `push()` method in this specific scenario.

Please note that benchmarking results can vary depending on the environment, hardware, and other factors.

Related benchmarks:

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

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

Comparing performance of: Spread vs Push

Created: 8 years ago by: Guest

Jump to the latest result

Spread

Push

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):