Benchmark: Array concat vs spread operator vs push32323

Tests:

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

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Suite status: <idle, ready to run>

Previous results

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

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

Measuring different approaches to array concatenation in JavaScript is an interesting test case.

**What's being tested?**

The benchmark is comparing three methods for adding elements to an array:

1. **`Array.prototype.concat()`**: This method concatenates two or more arrays into a new array.
2. **Spread operator (`...`)**: This syntax allows you to spread the elements of an array into another array, effectively creating a copy of one array and merging it with another.
3. **`push()` method**: This method adds one or more elements to the end of an existing array.

**Comparison**

The benchmark compares these three methods in terms of their performance, specifically:

* `concat()`: Requires an explicit call to create a new array, which can lead to additional overhead due to memory allocation and garbage collection.
* Spread operator: Creates a new array by spreading the original array's elements into it. This approach is often faster than `concat()` since it avoids creating an intermediate array.
* `push()` method: Modifies the existing array in-place, returning `undefined`. It can be faster than `concat()`, but might not work as expected if you need to preserve the original array.

**Pros and Cons**

Here's a brief summary of each approach:

* **`Array.prototype.concat()`**:
	+ Pros: Can be used with any array-like object.
	+ Cons: Creates an intermediate array, which can lead to additional overhead.
* **Spread operator (`...`)**:
	+ Pros: Faster than `concat()`, as it avoids creating an intermediate array.
	+ Cons: Requires JavaScript 5.0+, and might not work in older browsers or environments.
* **`push()` method**:
	+ Pros: Can be faster than `concat()`, as it modifies the existing array in-place.
	+ Cons: Might not work as expected if you need to preserve the original array, and can lead to unintended modifications.

**Libraries and special features**

There are no libraries or special features being tested in this benchmark. The focus is on comparing three basic methods for array concatenation.

**Alternatives**

Some alternative approaches to array concatenation include:

* Using `Array.from()` and `concat()`: Creates a new array from an iterable, then concatenates it with another array.
* Using `merge()` library: A utility function that merges two or more arrays into one, often optimized for performance.
* Using array destructuring: Assigns elements from one array to variables in another array.

Keep in mind that these alternatives might not be suitable for all use cases and may have their own trade-offs.

Related benchmarks:

Array concat vs spread operator vs push32323 (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: 5 years ago by: Guest

Jump to the latest result

Array.prototype.concat

spread operator

Push

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):