Benchmark: Array conct vs something esa;djf;lkaj

Tests:

Array.prototype.concat
let filters = { item_id: ["asdf","asdf"] } const items = Array.isArray(filters.item_id) ? filters.item_id.join("','") : filters.item_id;
spread operator
let filters = { item_id: ["asdf","asdf"] } const items1 = [].concat(filters.item_id).join("','");

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

Latest run results:

No previous run results

This benchmark does not have any results yet. Be the first one to run it!

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

LLMs can make mistakes. Check important info.

Let's break down the benchmark and its results.

**What is being tested?**

The test compares two approaches to concatenate arrays:

1. **Array.prototype.concat() method**: This is a built-in JavaScript method that concatenates two or more arrays into a new array.
2. **Spread operator (es6 syntax)**: The spread operator (`...`) can be used to expand an iterable (like an array) into individual elements.

**Options compared**

The test compares the performance of these two approaches:

* `Array.prototype.concat()` method
* Spread operator (`...`)

**Pros and Cons of each approach**

1. **Array.prototype.concat() method**:
	* Pros: Widely supported, efficient in modern browsers.
	* Cons: Can be slower due to the need for a function call (`.concat()` is a method), might not work as expected with certain array implementations.
2. **Spread operator (`...`)**:
	* Pros: More concise and expressive syntax, potentially faster since it doesn't require an extra function call or string concatenation.
	* Cons: Might be slower in older browsers that don't support the spread operator.

**Library and special JS features**

There are no specific libraries used in this benchmark. However, JavaScript engines might have their own internal optimizations or quirks that affect performance. The test only measures the performance of the two approaches themselves, without considering any external dependencies or browser-specific optimizations.

**Special JS feature (if applicable)**

The spread operator is a relatively new feature introduced in ECMAScript 2015 (ES6). If your JavaScript engine doesn't support ES6, you won't be able to use the spread operator.

**Other alternatives**

There are other ways to concatenate arrays, such as:

1. Using `join()` with an empty string: `[].join('') + [...array]`
2. Using `reduce()`: `[...array].reduce((a, b) => a + b)`
3. Using `forEach()` and concatenating strings manually

However, these alternatives are generally slower or less concise than the two approaches being tested.

**Benchmark results**

The benchmark results show that:

* The spread operator (`...`) is faster in this particular test case (55.39% faster) for a Chrome 94 browser on Mac OS X 10.15.7.
* The performance difference between the two approaches might be negligible or browser-dependent, as indicated by the slight variation in execution counts between the two tests.

Please note that benchmark results can vary depending on the specific test setup and execution conditions.

Related benchmarks:

Array conct vs something esa;djf;lkaj (version: 0)

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

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):