Benchmark: Array concat vs push

Script Preparation code:

var namespaces = ['loggerName', 'childLogger', 'grandChildLogger'];
var message = 'some log message doing something';
var optionalParamsArray = [ "hello", true, 7 ];
var optionalParamsObject = { some: "object", with: 1, property: true };

Tests:

Original code
var result = [namespaces.join('.')].concat(message, optionalParamsArray, optionalParamsObject)
push with spread operator
var result = [namespaces.join('.')]; result.push(message); result.push(...optionalParamsArray); result.push(optionalParamsObject);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Original code
push with spread operator

Fastest: N/A

Slowest: N/A

Latest 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 benchmark and explain what is being tested.

**What is being tested?**

The benchmark measures the performance difference between two approaches for concatenating arrays in JavaScript:

1. Using the `concat()` method: `var result = [namespaces.join('.')].concat(message, optionalParamsArray, optionalParamsObject)`
2. Using the spread operator (`...`) with `push()`: `var result = [namespaces.join('.')]; result.push(message); result.push(...optionalParamsArray); result.push(optionalParamsObject);`

**Options compared**

The benchmark compares two approaches:

* Original code using `concat()` method
* Modified code using spread operator (`...`) with `push()`

**Pros and Cons of each approach:**

1. **Original code using concat():**
	* Pros:
		+ Widely supported across browsers
		+ Can be used when working with existing codebases or legacy systems
	* Cons:
		+ Can lead to performance issues for large arrays due to the overhead of creating a new array
2. **Modified code using spread operator (with push()):**
	* Pros:
		+ More efficient than `concat()` method, especially for large arrays
		+ Allows for more flexible and expressive coding styles
	* Cons:
		+ May not be supported in older browsers or versions of JavaScript

**Library and its purpose**

There is no explicit library mentioned in the benchmark definition. However, it's worth noting that the `console.log` statement in the script preparation code suggests that the logger functionality may be using a logging library (e.g., `winston`, `log4js`). If this library is used extensively throughout the benchmark, its performance impact might be significant.

**Special JS feature or syntax**

The spread operator (`...`) with `push()` is a relatively modern JavaScript feature introduced in ECMAScript 2015. It's supported in most modern browsers and JavaScript engines. However, if you're targeting older browsers or environments that don't support this feature, the original code using `concat()` method might be necessary.

**Other alternatives**

If you need to optimize array concatenation performance, here are some alternative approaches:

* **Using `Array.prototype.reduce()`**: This method allows for more efficient concatenation by accumulating elements in an accumulator array.
* **Using `Array.prototype.concat()``` with a temporary variable**: This approach can provide better performance than the original code by avoiding unnecessary array creations.

For example:
```javascript
var result = Array.prototype.concat.call([], namespaces.join('.'), message, optionalParamsArray, optionalParamsObject);
```
However, these alternatives might not offer significant performance improvements unless dealing with extremely large arrays or performance-critical applications.

Overall, the benchmark provides a fair comparison between two approaches to array concatenation in JavaScript. It helps identify which approach is more efficient and suitable for your use case.

Related benchmarks:

Array concat vs push (version: 0)

Comparing performance of: Original code vs push with spread operator

Created: 4 years ago by: Guest

Jump to the latest result

Original code

push with spread operator

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):