Benchmark: Array concat vs spread vs push

Tests:

Concat
var params = [ "hello", true, 7 ]; var other = params.concat([ 1, 2 ]);
Spread
var params = [ "hello", true, 7 ] var other = [ ...params, 1, 2 ]
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
Concat
Spread
Push

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 tested?**

The provided benchmark compares three approaches to concatenate or manipulate arrays:

1. `concat()`: The traditional method for concatenating two arrays.
2. Spread operator (`...`): A new feature introduced in ES6 that allows creating a new array by spreading elements from an existing array.
3. `push()`: Adding elements to the end of an array using the `push()` method.

**Options compared**

The benchmark compares the performance of these three approaches:

* `concat()`: Uses the traditional `concat()` method to concatenate two arrays.
* Spread operator (`...`): Creates a new array by spreading elements from an existing array using the spread operator.
* `push()` (and subsequent iterations): Adds multiple elements to the end of an array using `push()` and then iterates over the array.

**Pros and cons of each approach**

1. **concat()**:
	* Pros: Well-established, widely supported, and easy to understand.
	* Cons: Can be slower than other approaches due to the overhead of creating a new array and concatenating elements.
2. **Spread operator (`...`)**:
	* Pros: More concise and expressive, as it creates a new array with spread elements without modifying the original array.
	* Cons: May have performance implications if used in large datasets or loops.
3. **push()` (and subsequent iterations)**:
	* Pros: Can be faster than `concat()` for larger arrays due to fewer overhead operations.
	* Cons: Requires multiple iterations, which can lead to increased memory allocation and garbage collection.

**Library usage**

There is no explicit library mentioned in the benchmark definition or test cases. However, the use of ES6 features like the spread operator indicates that modern JavaScript environments are being used.

**Special JS feature/syntax**

The benchmark uses a special syntax for iterating over an array (`for (var i = 0; i < array.length; i++)`) which is not specific to any particular language or library. However, it's worth noting that this syntax is widely supported in modern JavaScript environments.

**Other alternatives**

If the `push()` approach is too slow or inefficient, alternative methods can be explored:

* Using `Array.prototype.reduce()` to concatenate elements without creating a new array.
* Utilizing `Array.prototype.set()` to add multiple elements at once (though this method may have limitations and performance implications).
* Investigating other concatenation methods like using `Array.prototype.slice()` and `Array.prototype.splice()`, although these approaches might not be as efficient as others.

Keep in mind that the choice of approach depends on the specific use case, performance requirements, and trade-offs between code readability and efficiency.

Related benchmarks:

Array concat vs spread vs push (version: 0)

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

Comparing performance of: Concat vs Spread vs Push

Created: 6 years ago by: Registered User

Jump to the latest result

Concat

Spread

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):