Benchmark: Array.prototype.concat vs spread operator12

Tests:

Array.prototype.concat
var params = [ "hello", true, 7 ]; var a = {}; var other = params.concat(a);
spread operator
var params = [ "hello", true, 7 ]; var a = {}; var other = [ ...params, a];

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

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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 and explain what's being tested.

**Benchmark Overview**

The MeasureThat.net website hosts JavaScript microbenchmarks, which allows users to compare different coding approaches for various scenarios. The current benchmark is comparing two methods: `Array.prototype.concat` (traditional method) and the spread operator (`...`) (new ES6 feature).

**Test Case Comparison**

There are two test cases:

1. **Array.prototype.concat**
This test case uses a traditional approach, where an array `params` is concatenated with another object `a` using the `concat()` method.
```javascript
var params = [ "hello", true, 7 ];
var a = {};
var other = params.concat(a);
```
2. **Spread Operator (New ES6 Feature)**
This test case uses the spread operator (`...`) to create a new array by copying the elements of `params` and adding `a`.
```javascript
var params = [ "hello", true, 7 ];
var a = {};
var other = [...params, a];
```
**Options Compared**

The two options being compared are:

* **Traditional `concat()` method**: This is an older approach to concatenate arrays.
* **Spread Operator (`...`)**: This is a new ES6 feature that allows creating a new array by copying elements from an existing array.

**Pros and Cons of Each Approach**

**Traditional `concat()` method**

Pros:

* Well-established and widely supported
* Easy to understand and use

Cons:

* Can be slower due to the overhead of concatenating arrays
* May not be as efficient for large datasets

**Spread Operator (`...`)**

Pros:

* More concise and expressive
* Often faster than traditional `concat()` method due to optimized implementations
* Widely supported in modern browsers and JavaScript engines

Cons:

* May have compatibility issues with older browsers or environments that don't support ES6 features
* Can be less intuitive for developers who are not familiar with the spread operator

**Library and Syntax Considerations**

In this benchmark, no libraries are explicitly mentioned. However, it's worth noting that some modern JavaScript engines may include additional optimizations or polyfills for the spread operator.

As for syntax considerations, there is no special JavaScript feature or syntax being used in these test cases.

**Other Alternatives**

If you're looking for alternative methods to concatenate arrays or create new arrays from existing ones, here are a few examples:

* `Array.prototype.push()`: This method can be used to add elements to an array, but it's not as efficient as concatenating using the spread operator.
* `Array.prototype.slice()`: This method can be used to create a shallow copy of an array, but it's not as concise or expressive as the spread operator.
* `Array.from()`: This method can be used to create a new array from an iterable source, but it's not as directly comparable to the traditional `concat()` method.

Overall, the spread operator (`...`) is generally considered a more efficient and expressive way to concatenate arrays in modern JavaScript. However, it's essential to consider compatibility issues and performance characteristics depending on your specific use case and target audience.

Related benchmarks:

Array.prototype.concat vs spread operator12 (version: 0)

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

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

Created: 7 years ago by: Registered User

Jump to the latest result

Array.prototype.concat

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):