Benchmark: reduce concat vs apply concat

Script Preparation code:

var params = [[ 1, 2 ], [ "hello", true, 7 ], {Code: "3", Message: "Какая-то ошибка"},{Code: "2", Message: "Какая-то ошибка"}, [{Code: "1212121212", Message: "то ошибкато ошиб"}]];

Tests:

reduce concat
var other = params.reduce(function(previousValue, currentValue) { return previousValue.concat(currentValue) }, []);
concat.apply
var other = params.concat.apply([], this);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
reduce concat
concat.apply

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 7 months ago)

User agent: Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/140.0.0.0 Mobile Safari/537.36

Browser/OS: Chrome Mobile 140 on Android

View result in a separate tab

Test name	Executions per second
reduce concat	535041.2 Ops/sec
concat.apply	4116158.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what's being tested, compared, and the pros/cons of each approach.

**Benchmark Definition**

The benchmark is testing two ways to concatenate arrays in JavaScript:

1. Using `reduce()`: This method applies a function to each element in the array, reducing it to a single value.
2. Using `concat()` with `apply()`: This method calls the `concat()` method on an array object (in this case, an empty array), passing another array as an argument.

**Script Preparation Code**

The script preparation code defines an array of arrays (`params`) that will be used in the benchmark. The inner arrays contain various data types (numbers, strings, objects).

**HTML Preparation Code**

There is no HTML preparation code provided, which means that this benchmark only tests JavaScript performance and does not involve rendering or layout.

**Individual Test Cases**

The two test cases are:

1. `reduce concat`: This test case uses the `reduce()` method to concatenate all inner arrays in `params`.
2. `concat.apply`: This test case uses the `concat()` method with `apply()` to concatenate all inner arrays in `params`.

**Pros and Cons of Each Approach**

**Reduce()**

Pros:

* More flexible: Can be used to implement various types of reductions (e.g., sum, product, maximum).
* Less memory-intensive than concatenating arrays.

Cons:

* May be slower for very large datasets due to the overhead of function calls.
* Requires more CPU cycles to execute.

**Concat() with Apply()**

Pros:

* Faster execution speed, especially for large datasets.
* More straightforward and easier to understand for simple use cases.

Cons:

* Less flexible than `reduce()`.
* Can be less memory-efficient because it creates a new array each time it's called.

In general, `concat()` with `apply()` is faster but less flexible than `reduce()`. However, the choice between these two approaches depends on the specific use case and requirements of your application.

**Library**

There is no explicit library mentioned in the benchmark, but `Array.prototype.reduce()` and `Array.prototype.concat()` are built-in methods in JavaScript.

**Special JS Feature/Syntax**

There are no special JavaScript features or syntax used in this benchmark. The code only uses standard JavaScript syntax and features.

**Other Alternatives**

If you wanted to test other ways of concatenating arrays, some alternatives could include:

* Using `Array.prototype.push()` and `Array.prototype.splice()`: This approach would involve pushing elements onto an array or removing elements from the end of an array.
* Using a library like Lodash's `flattenDeep()` function: This approach would rely on an external library to flatten nested arrays.

However, since this benchmark is primarily focused on comparing two simple approaches (`reduce()` and `concat() with apply()`), these alternative methods might not be relevant or meaningful for this specific comparison.

Related benchmarks:

reduce concat vs apply concat (version: 2)

Array flat es5 syntax (reduce concat vs apply concat)

Comparing performance of: reduce concat vs concat.apply

Created: 5 years ago by: Registered User

Jump to the latest result

reduce concat

concat.apply

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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