Benchmark: Array.prototype.concat vs spread operator vs push OPT

Tests:

Array.prototype.concat
var params = [ "hello", true, 7 ]; var other = [ 1, 2 ].concat(params);
spread operator
var params = [ "hello", true, 7 ] var other = [ 1, 2, ...params ]
Push
var params = [ "hello", true, 7 ]; params.push(1); params.push(2);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.prototype.concat
spread operator
Push

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/116.0.5845.837 YaBrowser/23.9.4.837 Yowser/2.5 Safari/537.36

Browser/OS: Yandex Browser 23 on Windows

View result in a separate tab

Test name	Executions per second
Array.prototype.concat	12899904.0 Ops/sec
spread operator	68280568.0 Ops/sec
Push	111517664.0 Ops/sec

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

LLMs can make mistakes. Check important info.

**Overview**

The provided benchmark measures the performance of three different approaches for concatenating or pushing elements to an array in JavaScript:

1.  `Array.prototype.concat()`
2.  The new ES6 spread operator (`...`)
3.  The `push()` method

These approaches are compared in a series of test cases, each testing a specific scenario.

**Benchmark Definition**

The benchmark definition provides the following information:

*   **Name**: A unique name for the benchmark.
*   **Description**: A brief description of the benchmark, which is used to explain the purpose of the benchmark. In this case, it's comparing the new ES6 spread operator with traditional methods like `concat()` and `push()`.
*   **Script Preparation Code** and **HTML Preparation Code**: These fields are empty, indicating that no custom code needs to be executed before running the benchmark.

**Individual Test Cases**

The benchmark consists of three test cases:

1.  `Array.prototype.concat`: Tests the performance of concatenating an array using the `concat()` method.
    *   The benchmark preparation code creates an array `params` and another array `[1, 2]`. It then calls the `concat()` method to concatenate these two arrays.
2.  **Spread Operator**: Tests the performance of using the spread operator (`...`) to concatenate an array with another array.
    *   The benchmark preparation code creates an array `params` and another array `[1, 2]`. It then uses the spread operator to concatenate these two arrays.
3.  **Push**: Tests the performance of pushing elements to an existing array using the `push()` method.
    *   The benchmark preparation code creates an array `params`, pushes two new elements onto it, and repeats this process multiple times.

**Pros and Cons**

Here's a brief overview of each approach:

*   **Array.prototype.concat()**: This method is traditional and widely supported. However, it can be slow for large arrays due to the overhead of creating a new array and copying elements.
    *   Pros: Widely supported, easy to use.
    *   Cons: Slow for large arrays.
*   **Spread Operator (`...`)**: Introduced in ES6, this operator provides a concise way to concatenate arrays. However, it may have performance issues due to the overhead of creating a new array and copying elements.
    *   Pros: Concise syntax, easy to use.
    *   Cons: Performance issues for large arrays.
*   **Push**: This method is also traditional and widely supported. It's generally faster than `concat()` for small arrays but can be slower for larger ones due to the overhead of dynamic array resizing.
    *   Pros: Fast for small arrays, easy to use.
    *   Cons: Can be slow for large arrays.

**Library Considerations**

In this benchmark, there are no libraries used beyond the built-in JavaScript features mentioned above. However, if a library were required, some popular options include:

*   Lodash
*   Underscore.js
*   Ramda

These libraries provide various utility functions and algorithms that might be useful in specific scenarios but aren't directly related to array concatenation or pushing.

**Special JS Features**

This benchmark doesn't explicitly use any special JavaScript features beyond the ES6 spread operator. However, it does rely on modern JavaScript engines like Chrome's and Yandex Browser's implementation of the new syntax features.

If this benchmark were modified to include more advanced features, options might include:

*   `let` or `const` declarations for variable scoping.
*   Arrow functions.
*   Template literals.
*   Promises or async/await syntax.

However, without specific instructions or requirements, these advanced features would need to be justified and relevant to the benchmark's purpose.

**Alternatives**

If you're looking for alternatives to this benchmark, here are some options:

1.  **Benchmarking frameworks**: Tools like Benchmark.js, Fastbench, or JSPerf can help create more comprehensive benchmarks with additional test cases and statistics.
2.  **JavaScript performance optimization**: Analyzing code optimizations and benchmarking techniques specific to the target JavaScript engine (e.g., V8 in Chrome) might be a better fit for optimizing performance.
3.  **Microbenchmarking frameworks**: Frameworks like micro-benchmark or benchmark can provide additional features, such as filtering and sorting results by execution time.

Related benchmarks:

Array.prototype.concat vs spread operator vs push OPT (version: 0)

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

Comparing performance of: Array.prototype.concat vs spread operator vs Push

Created: 4 years ago by: Guest

Jump to the latest result

Array.prototype.concat

spread operator

Push

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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