Benchmark: Array.prototype.concat.apply vs Array.prototype.concat + spread vs Array.prototype.flat operator

Tests:

Array.prototype.concat.apply
var params = [ [1, 2], [3, 4], [5, 6] ]; var result = [].concat.apply([], params);
Array.prototype.concat + spread operator
var params = [ [1, 2], [3, 4], [5, 6] ]; var result = [].concat(...params);
Array.prototype.flat
var params = [ [1, 2], [3, 4], [5, 6] ]; var result = params.flat();

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.prototype.concat.apply
Array.prototype.concat + spread operator
Array.prototype.flat

Fastest: N/A

Slowest: N/A

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Autogenerated LLM Summary (model gemma2:9b, generated one year ago):

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This benchmark compares three different ways to combine multiple arrays in JavaScript:

**1. `Array.prototype.concat.apply`:** This method uses the `concat()` function with `apply()` to concatenate the arrays. It's a traditional approach that has been used for a long time.

**2. `Array.prototype.concat + spread operator`:** This method utilizes the spread operator (`...`) to expand each array into its individual elements within a new array created using `concat()`. Introduced in ES6, this is a more concise and modern syntax.

**3. `Array.prototype.flat`:** This method directly flattens nested arrays into a single array. It's the most straightforward approach for combining arrays with multiple levels of nesting, but it might not be as performant for simple flat combinations.

**Pros and Cons:**

* **`concat.apply`:**
    * **Pro:** Widely supported and understood by developers.
    * **Con:** Can be verbose and less readable compared to newer methods.

* **`concat + spread operator`:**
    * **Pro:** Concise, readable syntax thanks to the spread operator. Generally considered more performant than `concat.apply`.
    * **Con:** Requires knowledge of ES6 syntax.

* **`flat`:**
    * **Pro:** Highly efficient for flattening nested arrays. Simple and intuitive.
    * **Con:** Might not be as efficient for simple flat combinations compared to `concat + spread`.

**Alternatives:**

* **Manual looping:** While possible, this approach is generally less efficient and more complex than the methods described above.

This benchmark allows you to compare the performance of these different approaches in a controlled environment, helping you choose the most suitable method based on your specific needs.

Related benchmarks:

Array.prototype.concat.apply vs Array.prototype.concat + spread vs Array.prototype.flat operator (version: 0)

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

Comparing performance of: Array.prototype.concat.apply vs Array.prototype.concat + spread operator vs Array.prototype.flat

Created: 5 years ago by: Guest

Jump to the latest result

Array.prototype.concat.apply

Array.prototype.concat + spread operator

Array.prototype.flat

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

Autogenerated LLM Summary (model gemma2:9b, generated one year ago):