Benchmark: Array.prototype.concat vs spread operator!

Tests:

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

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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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**Overview of the Benchmark**

The MeasureThat.net benchmark is designed to compare the performance of two approaches for concatenating arrays in JavaScript: the traditional `Array.prototype.concat()` method and the new ES6 spread operator (`...`).

**Test Cases**

There are two test cases:

1. **Array.prototype.concat**: This test case uses the traditional `concat()` method to concatenate an array `params` with another array `[ 1, 2 ]`.
```javascript
var params = [ "hello", true, 7 ];
var other = [ 1, 2 ].concat(params);
```
2. **Spread Operator**: This test case uses the new ES6 spread operator (`...`) to concatenate an array `params` with another array `[ 1, 2 ]`.
```javascript
var params = [ "hello", true, 7 ];
var other = [ 1, 2, ...params ];
```
**Options Compared**

The benchmark compares the performance of these two approaches:

* **Traditional concat() method**: This approach uses the `concat()` method to concatenate the arrays.
* **New ES6 spread operator**: This approach uses the new syntax (`...`) to expand the elements of an array and concatenate it with another array.

**Pros and Cons**

* **Traditional concat() method**:
	+ Pros: Wide support, easy to understand and implement.
	+ Cons: Can be slower than the spread operator for large arrays, as it creates a new copy of the original array.
* **New ES6 spread operator**:
	+ Pros: Faster than traditional `concat()` method for large arrays, more concise syntax.
	+ Cons: Limited support in older browsers and environments, may not work as expected with certain data types.

**Library and Features**

There is no specific library used in this benchmark. However, the use of modern JavaScript features like the spread operator (`...`) requires a supporting browser or environment.

**Other Considerations**

When choosing between these two approaches, consider the following:

* **Performance**: If you need to concatenate large arrays frequently, the new ES6 spread operator may be faster.
* **Code readability and maintainability**: The traditional `concat()` method is often easier to understand and implement, especially for developers who are not familiar with modern JavaScript features.
* **Browser support**: Make sure that your target browser or environment supports the new ES6 spread operator.

**Alternatives**

Other alternatives for concatenating arrays in JavaScript include:

* Using the `Array.prototype.push()` method with multiple arguments: `arr.push(...[1, 2])`.
* Using a library like Lodash (with its `concatBy` function) or Ramda (with its `concatAll` function).
* Implementing your own custom array concatenation function.

Related benchmarks:

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

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

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

Created: 4 years ago by: Guest

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):