Benchmark: babel concat vs babel spread vs babel push es-2015

HTML Preparation code:

<div id=''></div>

Tests:

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

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
concat
spread operator
push

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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I'll break down the provided JSON and benchmark explanation to help understand what's being tested.

**Benchmark Overview**

MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks. The provided benchmark compares three approaches for concatenating or spreading arrays using the `concat` and `push` methods in ES2015 JavaScript.

**Script Preparation Code**

The script preparation code is not explicitly provided, but it's likely that the benchmark creator generated a sample JavaScript code snippet to test each approach. For example:
```javascript
var params = [ "hello", true, 7 ];
var other = [];
```
**Individual Test Cases**

There are three individual test cases:

1. **`concat`**: Tests the `concat` method for concatenating two arrays.
```javascript
var params = [ "hello", true, 7 ];
var other = [ 1, 2 ].concat(params);
```
This approach creates a new array by copying the elements of `[ 1, 2 ]` and then appending the elements of `params`.

Pros:

* Easy to understand and implement.
* Widely supported in browsers.

Cons:

* Creates a new array object, which can be memory-intensive for large datasets.

2. **`spread operator`**: Tests the spread operator (`...`) for spreading an array into another array.
```javascript
var params = [ "hello", true, 7 ];
var other = [ 1, 2 ].concat(...params);
```
This approach uses the spread operator to distribute the elements of `params` across multiple positions in the `other` array.

Pros:

* More memory-efficient than creating a new array using `concat`.
* Can be more efficient for large datasets.

Cons:

* Requires support for the spread operator in modern browsers.
* Can lead to unexpected behavior if not used correctly.

3. **`push`**: Tests the `push` method for appending elements to an array.
```javascript
var _ref;
var params = [ "hello", true, 7 ];
var other = (_ref = [ 1, 2 ]).push.apply(_ref, params);
```
This approach uses a closure trick to apply the `push` method to the `other` array while preserving its original reference.

Pros:

* More memory-efficient than creating a new array using `concat`.
* Can be more efficient for large datasets.

Cons:

* Requires support for closures and the `push` method in modern browsers.
* Can lead to unexpected behavior if not used correctly.

**Library**

None of the test cases use any external libraries. However, it's worth noting that some JavaScript engines or browsers might optimize certain methods (e.g., `concat`) differently than others due to their implementation.

**Special JS Features**

The spread operator (`...`) is a new feature introduced in ES2015, which allows for more concise and expressive array manipulation. The use of closures in the `push` test case also demonstrates some advanced JavaScript techniques.

**Other Alternatives**

If you wanted to compare these approaches using other methods, you might consider:

* Using `Array.prototype.reduce()` instead of `concat`.
* Utilizing the `Set` data structure for efficient element addition.
* Employing a custom implementation for array concatenation or spreading.
* Comparing performance with different JavaScript engines (e.g., V8, SpiderMonkey).

However, these alternatives would likely add complexity to the benchmark and may not be relevant for most use cases.

Related benchmarks:

babel concat vs babel spread vs babel push es-2015 (version: 0)

Comparing performance of: concat vs spread operator vs push

Created: 5 years ago by: Guest

Jump to the latest result

concat

spread operator

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):