Benchmark: Concat vs Spread vs flat

Tests:

concat
const a = [1,2,3,4,5,6,7,8,9,0]; const b = [1,2,3,4,5,6,7,8,9,0]; const result = a.concat(b);
spread
const a = [1,2,3,4,5,6,7,8,9,0]; const b = [1,2,3,4,5,6,7,8,9,0]; const result = [...a, ...b];
flat
const a = [1,2,3,4,5,6,7,8,9,0]; const b = [1,2,3,4,5,6,7,8,9,0]; const result = [a,b].flat();

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
concat
spread
flat

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 benchmarking test cases.

**Benchmark Definition and Script Preparation Code**

The benchmark is designed to compare three approaches for concatenating or merging arrays in JavaScript: `concat`, `spread` (using the spread operator), and `flat`. The script preparation code is empty, which means that the baseline execution time is the default JavaScript engine's performance without any additional optimizations.

**Test Cases**

There are three individual test cases:

1. **`concat`**: This test case uses the traditional `concat()` method to merge two arrays, `[1,2,3,4,5,6,7,8,9,0]` and `[1,2,3,4,5,6,7,8,9,0]`.
2. **`spread`**: This test case uses the spread operator (`...`) to merge two arrays, `[1,2,3,4,5,6,7,8,9,0]` and `[1,2,3,4,5,6,7,8,9,0]`. This is a modern JavaScript syntax introduced in ECMAScript 2015.
3. **`flat`**: This test case uses the `flat()` method to merge two arrays, `[1,2,3,4,5,6,7,8,9,0]` and `[1,2,3,4,5,6,7,8,9,0]`. Note that this is not a standard array method in JavaScript. The `flat()` method was introduced in ECMAScript 2019 as part of the Array.prototype.flat() method.

**Pros and Cons**

Here's a brief summary of the pros and cons of each approach:

1. **`concat`**:
	* Pros: Widely supported, easy to read and write.
	* Cons: Can be slower due to the creation of a new array object.
2. **`spread`**:
	* Pros: Modern syntax, efficient execution time.
	* Cons: Requires support for ECMAScript 2015 or later.
3. **`flat`**:
	* Pros: Efficient execution time, flexible flattening behavior (optional depth parameter).
	* Cons: Not a standard array method in JavaScript, requires support for ECMAScript 2019 or later.

**Other Considerations**

When choosing between these approaches, consider the following:

* If you need to concatenate two arrays with minimal performance impact, `concat` might be sufficient.
* If you're writing modern JavaScript code and want efficient execution time, `spread` is a good choice.
* If you need more control over array flattening or require support for ECMAScript 2019 or later, `flat` is the way to go.

**Library/External Function**

None of these test cases rely on external libraries or functions. They only use built-in JavaScript methods and syntax.

**Special JS Feature/Syntax**

Only one special feature/syntax is used in this benchmark:

* The spread operator (`...`) introduced in ECMAScript 2015.
* The `flat()` method introduced in ECMAScript 2019.

If you're not familiar with these features, don't worry! They're relatively easy to understand and use.

**Alternative Benchmarks**

There are alternative benchmarks available for testing array concatenation methods. Some examples include:

* Google's Benchmarking library: This library provides a set of pre-defined benchmarking tests for various JavaScript scenarios.
* JSPerf: A popular online tool for benchmarking JavaScript performance.
* Browser-specific benchmarking tools: Many browsers, such as Chrome and Firefox, provide their own benchmarking tools that can be used to compare the performance of different array concatenation methods.

Related benchmarks:

Concat vs Spread vs flat (version: 0)

Comparing performance of: concat vs spread vs flat

Created: 4 years ago by: Guest

Jump to the latest result

concat

spread

flat

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):