Benchmark: test1 array concat vs spred 2

Script Preparation code:

var params = ["hello", true, 7];

Tests:

spred
var other = [ ...[ 1, 2 ], ...params ]
concat
var other = [1, 2].concat(params);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
spred
concat

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 Safari/537.36

Browser/OS: Chrome 136 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
spred	42846028.0 Ops/sec
concat	14395585.0 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks.

**Benchmark Overview**

The provided JSON represents two benchmark test cases: `test1 array concat vs spred` and its individual test cases, which compare the performance of using the spread operator (`...`) versus concatenation for array operations. The benchmark aims to measure the execution speed of these two approaches on various browsers.

**What is tested?**

The benchmark tests the execution speed of two different methods:

1. **Spread Operator (`...`)**: This method uses the spread operator to create a new array by copying elements from an existing array.
2. **Concatenation**: This method uses the `concat()` function to concatenate multiple arrays into one.

**Options compared**

The benchmark compares the performance of these two approaches for a specific use case:

* Creating a new array by spreading elements from another array (`...`).
* Concatenating arrays using `concat()`.
* The order in which parameters are passed to the `concat()` function: `[1, 2].concat(params)` versus `[ ...[1, 2], ...params ]`.

**Pros and Cons of each approach**

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

Pros:

* Can be more concise and expressive when working with arrays.
* Often faster than concatenation for large datasets.

Cons:

* May not be supported in older browsers or environments that don't understand the spread operator syntax.
* Requires modern JavaScript features, which can add complexity to code maintenance.

**Concatenation**

Pros:

* More widely supported across different browsers and environments.
* Less prone to errors due to its explicit nature.

Cons:

* Can lead to slower performance for large datasets compared to the spread operator.
* May result in more memory allocation and garbage collection overhead.

**Other considerations**

When working with arrays, it's essential to consider factors like array size, data type, and browser support. In some cases, the spread operator might be a better choice due to its readability and potential performance benefits. However, if compatibility is crucial or performance is critical for large datasets, concatenation might be a more reliable option.

**Library usage**

The provided benchmark uses no external libraries; it relies solely on native JavaScript features.

**Special JS feature/syntax**

The benchmark uses the spread operator (`...`) syntax, which was introduced in ECMAScript 2015 (ES6). This feature allows for concise array creation and manipulation. While widely supported, older browsers or environments might not understand this syntax, so it's essential to consider compatibility when using modern JavaScript features.

**Alternatives**

If you're interested in alternative methods for array operations, here are a few options:

* **Array.prototype.push()**: This method can be used to add elements to an existing array, but it modifies the original array.
* **Array.prototype.slice()**: This method returns a shallow copy of an array segment.
* **Array.prototype.map(), Array.prototype.filter(), and Array.prototype.reduce()**: These methods perform element-wise transformations on arrays.

Keep in mind that each approach has its own trade-offs, performance characteristics, and compatibility considerations. When choosing the right method for your use case, consider factors like readability, performance, and browser support.

Related benchmarks:

test1 array concat vs spred 2 (version: 0)

Comparing performance of: spred vs concat

Created: 5 years ago by: Guest

Jump to the latest result

spred

concat

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):