Benchmark: Array.prototype.concat vs spread operator - j

Tests:

Array.prototype.concat
var params = [ "hello", true, 7,1,2,3,'a','a','a','a','a','a','a','a','a','a','a','a','a','a','a' ]; var other = [ 1, 2 ].concat(params);
spread operator
var params = [ "hello", true, 7,1,2,3,'a','a','a','a','a','a','a','a','a','a','a','a','a','a','a' ]; var other = [ 1, 2, ...params ];

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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, compared, and their pros and cons.

**Benchmark Overview**

The benchmark compares two approaches to concatenate an array: the traditional `Array.prototype.concat()` method and the new ES6 spread operator (`...`).

**Options Compared**

1. **Traditional `Array.prototype.concat()`**: This method creates a new array by concatenating the elements of the original array with the provided array.
2. **ES6 Spread Operator (`...`)**: This method creates a new array by spreading the elements of the original array and appending them to the target array.

**Pros and Cons**

**Traditional `Array.prototype.concat()`**

Pros:

* Wide browser support, including older browsers that may not have native support for the spread operator.
* Can be used with arrays of any type (not just objects).

Cons:

* Creates a new array, which can lead to increased memory allocation and garbage collection overhead.
* Can be slower due to the creation of a new array.

**ES6 Spread Operator (`...`)**

Pros:

* More concise and expressive syntax, making it easier to read and write.
* Creates a new array with minimal overhead.

Cons:

* Requires modern browsers that support the spread operator (Chrome 88 in this benchmark).
* May not work correctly with older browsers or arrays of certain types.

**Library Usage**

Neither option uses any external libraries. The ES6 spread operator is a built-in feature of JavaScript, while `Array.prototype.concat()` is a standard method provided by the ECMAScript specification.

**Special JS Feature/Syntax**

The benchmark highlights the use of the ES6 spread operator (`...`), which was introduced in ECMAScript 2015 (ES6). This syntax allows for more concise and expressive array creation. While not specific to this benchmark, it's worth noting that other modern JavaScript features like `let`, `const`, and classes were also introduced with ES6.

**Other Alternatives**

If you need to support older browsers or want to avoid the spread operator's syntax, alternative approaches include:

1. Using `Array.prototype.push()` with multiple arguments: `arr.push(...params)`.
2. Using a loop to iterate over the array elements and append them to the target array.
3. Utilizing libraries like Lodash, which provides a `concat` function that can be used as an alias for the spread operator.

Keep in mind that these alternatives may have different performance characteristics or syntax requirements compared to the traditional `Array.prototype.concat()` method and the ES6 spread operator.

Related benchmarks:

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

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

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

Created: 5 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):