Benchmark: Push apply vs push spread vs concat v2

Script Preparation code:

var a1 = [ "hello", "world", true ];
var a2 = [ 42, false, "universe", { number: 12 } ];

Tests:

Concat
a1.concat(a2);
Push apply
a1.push.apply(a1, a2)
Push spread
a1.push(...a2)
Push single
a2.forEach(e => a1.push(a2))

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Concat
Push apply
Push spread
Push single

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

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

LLMs can make mistakes. Check important info.

Let's break down the benchmark and its test cases.

**Benchmark Definition**

The benchmark is defined by a JSON object with three properties:

* `Name`: A human-readable name for the benchmark, which is "Push apply vs push spread vs concat v2".
* `Description`: An optional description of the benchmark, which is null in this case.
* `Script Preparation Code`: A string that defines the initial state of the variables used in the benchmark. In this case, two arrays are created: `a1` and `a2`. `a1` contains three elements: a string "hello", a string "world", and a boolean true. `a2` contains four elements: an integer 42, a boolean false, a string "universe", and an object with a property number equal to 12.
* `Html Preparation Code`: An optional string that defines the HTML code used to prepare the benchmark, which is null in this case.

**Test Cases**

The benchmark consists of four individual test cases, each defined by a JSON object with two properties:

* `Benchmark Definition`: A string that defines the JavaScript code to be executed during the benchmark. In this case:
	+ Test Case 1: `a1.concat(a2);`
	+ Test Case 2: `a1.push.apply(a1, a2);`
	+ Test Case 3: `a1.push(...a2);`
	+ Test Case 4: `a2.forEach(e => a1.push(a2));`
* `Test Name`: A human-readable name for each test case.

**Options Compared**

The four test cases compare the performance of different approaches to push elements onto an array:

* Test Case 1: `concat()`
* Test Case 2: `push.apply()`
* Test Case 3: Spread operator (`...`)
* Test Case 4: Using `forEach()` with a callback function

**Pros and Cons**

Here's a brief summary of the pros and cons of each approach:

* **`concat()`**: Pros: simple and concise. Cons: can be slower than other approaches, especially for large arrays.
* **`push.apply()`**: Pros: similar to `push()`, but can be faster for very large arrays. Cons: requires an extra method call.
* **Spread operator (`...`)**: Pros: concise and easy to read. Cons: may incur a small overhead due to the creation of a temporary array.
* **Using `forEach()` with a callback function**: Pros: can avoid mutating the original array, which might be desirable in some cases. Cons: slower than other approaches due to the iteration.

**Library**

There is no explicit library mentioned in the benchmark definition or test cases. However, it's possible that the browser being tested (Chrome 70) has optimized implementations of these methods that are not exposed in the standard JavaScript API.

**Special JS Feature/Syntax**

The spread operator (`...`) is a relatively recent addition to JavaScript, introduced in ECMAScript 2015 (ES6). It allows for concise and expressive code when working with arrays or objects.

I hope this explanation helps! Let me know if you have any further questions.

Related benchmarks:

Push apply vs push spread vs concat v2 (version: 0)

Comparing performance of: Concat vs Push apply vs Push spread vs Push single

Created: 7 years ago by: Guest

Jump to the latest result

Concat

Push apply

Push spread

Push single

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):