Benchmark: Concat Vs Spread [eungwang4]

Script Preparation code:

var firstArray = Array.from({length : 500}, (v,i) => ({id : i, name : `firstArray${i}`}))
var secondArray = Array.from({length : 500}, (v,i) => ({id : i, name : `secondArray${i}`}))

Tests:

concat
return firstArray.concat(secondArray);
spread
return [...firstArray,secondArray];

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
concat
spread

Fastest: N/A

Slowest: N/A

Latest run results:

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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 on MeasureThat.net.

**Benchmark Definition**

The benchmark definition provides the basic information about the test case, including its name and description (which is empty in this case). The script preparation code sets up two arrays, `firstArray` and `secondArray`, each containing 500 elements with a unique `id` and `name` property. These arrays are created using the `Array.from()` method with an array literal.

The HTML preparation code is empty, which means that this benchmark doesn't rely on any specific HTML structure or rendering.

**Individual Test Cases**

We have two test cases:

1. **concat**: This test case measures the performance of concatenating two arrays using the `concat()` method.
2. **spread**: This test case measures the performance of spreading an array into another array using the spread operator (`...`).

**Options Compared**

In this benchmark, we're comparing two approaches to merge the two arrays:

* **Concatenation** (using `concat()`)
* **Spread Operator** (using `...`)

**Pros and Cons of Each Approach**

1. **Concatenation**:
	* Pros: Simple and widely supported, easy to understand.
	* Cons: Can be slower for large datasets due to the overhead of creating a new array.
2. **Spread Operator**:
	* Pros: More concise and efficient for large datasets, as it avoids the overhead of creating a new array.
	* Cons: May not be supported in older browsers or environments.

**Other Considerations**

When choosing between these two approaches, consider the following:

* If you need to merge arrays with different lengths, concatenation might be a better choice, as it allows for more control over the resulting array.
* For large datasets, the spread operator can provide a significant performance boost due to its efficiency in avoiding array creation overhead.

**Library Usage**

In this benchmark, there are no external libraries used. The `Array.from()` method is part of the ECMAScript standard, and the spread operator (`...`) is also a built-in feature of JavaScript.

**Special JS Features or Syntax**

There are no special features or syntax used in this benchmark that require additional explanation.

**Other Alternatives**

If you need to merge arrays in other ways (e.g., using `Array.prototype.reduce()`), here are some alternatives:

* Using `Array.prototype.push()`: Instead of concatenating or spreading the arrays, you can push elements from one array into another.
* Using a library like Lodash: Lodash provides several functions for merging arrays, such as `lodash.intersection()` and `lodash.union()`.

Keep in mind that these alternatives might not be directly comparable to the original benchmark's results, as they may introduce additional overhead or complexity.

Related benchmarks:

Concat Vs Spread [eungwang4] (version: 0)

Comparing performance of: concat vs spread

Created: 3 years ago by: Guest

Jump to the latest result

concat

spread

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):