Benchmark: Comparing array concat operations

HTML Preparation code:

<script src="https://cdnjs.cloudflare.com/ajax/libs/ramda/0.25.0/ramda.js"></script>

Script Preparation code:

var params = [ "hello", true, 7 ];

Tests:

Array.prototype.concat
var result = [ 1, 2 ].concat(params);
spread operator
var result = [ 1, 2, ...params ];
Ramda assoc
const result = R.concat([1, 2], params);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.prototype.concat
spread operator
Ramda assoc

Fastest: N/A

Slowest: N/A

Latest run results:

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

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Let's dive into the world of JavaScript microbenchmarks!

**What is being tested?**

The provided JSON represents a benchmarking test case that compares three different ways to concatenate arrays in JavaScript:

1. `Array.prototype.concat()`
2. Spread operator (`...`)
3. Ramda library's `R.concat()` function (using Ramda, a functional programming library)

**Options compared:**

*   **`Array.prototype.concat()`**: This is the built-in array method for concatenating arrays. It creates a new array and returns it.
*   **Spread operator (`...`)**: This is a syntax feature introduced in ES6 that allows you to expand an array or object into individual elements.
*   **Ramda library's `R.concat()` function**: Ramda is a functional programming library for JavaScript that provides various utility functions, including `concat()`.

**Pros and Cons of each approach:**

1.  **`Array.prototype.concat()`**:
    *   Pros:
        *   Built-in method, widely supported.
        *   Easy to read and understand.
    *   Cons:
        *   Creates a new array object, which can be memory-intensive for large arrays.
        *   Returns an array, so you need to handle the result if needed.
2.  **Spread operator (`...`)**:
    *   Pros:
        *   Efficient and concise syntax.
        *   Does not create a new array, modifying the original instead.
    *   Cons:
        *   Syntax can be less readable for complex operations.
        *   Not supported in older browsers or environments that do not understand ES6+ features.
3.  **Ramda library's `R.concat()` function**:
    *   Pros:
        *   Provides a functional programming perspective on array concatenation.
        *   Can be more expressive and concise for certain use cases.
    *   Cons:
        *   Requires including the Ramda library in your project, which may add overhead.
        *   May have different performance characteristics compared to native methods.

**Other considerations:**

*   When using `Array.prototype.concat()`, consider the trade-off between memory usage and conciseness. If you're working with large arrays or need efficient concatenation for performance-critical code, using `concat()` might be a better choice.
*   The spread operator can simplify your code but may have performance implications when working with large datasets. Its efficiency makes it suitable for most cases where readability is not an issue.

**Ramda library usage:**

In the provided benchmark definition, Ramda's `R.concat()` function is used to concatenate arrays. This indicates that the test aims to evaluate the performance of this specific function in comparison to other methods.

**ES6+ features and syntax:**

The spread operator (`...`) is being tested within the context of array concatenation. While it may not be explicitly mentioned as a feature, its usage does highlight ES6's influence on modern JavaScript syntax and best practices.

**Alternatives to these test cases:**

Other methods for array concatenation in JavaScript might include:

*   Using `Array.prototype.push()` to append elements to an existing array.
*   Utilizing `String.join()` with an array of strings to concatenate them into a single string, then converting the result back to an array if needed.
*   Implementing custom implementation using `for` loops or other methods that are less efficient and more verbose.

Related benchmarks:

Comparing array concat operations (version: 0)

Comparing performance of: Array.prototype.concat vs spread operator vs Ramda assoc

Created: 4 years ago by: Guest

Jump to the latest result

Array.prototype.concat

spread operator

Ramda assoc

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):