Benchmark: Array.push - MeasureThat.net

Script Preparation code:

var n = 10;
function Person(name, age) {
  this.name = name;
  this.age = age;
}

Tests:

direct addition
var arr = [ new Person(1 + '', 24), new Person(2 + '', 24), new Person(3 + '', 24), new Person(4 + '', 24), new Person(5 + '', 24), new Person(6 + '', 24), new Person(7 + '', 24), new Person(8 + '', 24), new Person(9 + '', 24), new Person(10 + '', 24) ].join(',');
Array.push without comma
var arr = []; arr.push (new Person(1 + '', 24)); arr.push (new Person(2 + '', 24)); arr.push (new Person(3 + '', 24)); arr.push (new Person(4 + '', 24)); arr.push (new Person(5 + '', 24)); arr.push (new Person(6 + '', 24)); arr.push (new Person(7 + '', 24)); arr.push (new Person(8 + '', 24)); arr.push (new Person(9 + '', 24)); arr.push (new Person(10 + '', 24)); arr.join(',');
Array.push with comma
var arr = []; arr.push ( new Person(1 + '', 24), new Person(2 + '', 24), new Person(3 + '', 24), new Person(4 + '', 24), new Person(5 + '', 24),new Person(6 + '', 24),new Person(7 + '', 24), new Person(8 + '', 24),new Person(9 + '', 24),new Person(10 + '', 24) ); arr.join(',');

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
direct addition
Array.push without comma
Array.push with comma

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 26 days ago):

LLMs can make mistakes. Check important info.

Let's dive into the explanation of the benchmark.

**Benchmark Definition:**

The benchmark is designed to measure the performance of the `Array.push` method in JavaScript. The script preparation code defines a `Person` constructor, and the HTML preparation code is empty (i.e., no extra HTML elements are generated). The benchmark definition consists of three test cases:

1. **Direct addition**: An array of 10 `Person` objects is created directly inside the `Array.push` method.
2. **Array.push without comma**: An array of 10 `Person` objects is created and then passed to `Array.push`, which then adds each object individually using the comma operator.
3. **Array.push with comma**: An array of 10 `Person` objects is created, but with commas separating each object before being passed to `Array.push`.

**Options Compared:**

The benchmark compares three different approaches for adding elements to an array using `Array.push`. The options are:

* Direct addition (Test Case 1): Creating the entire array within the `Array.push` method.
* Array.push without comma (Test Case 2): Creating a separate array and then passing it to `Array.push`, which adds each element individually.
* Array.push with comma (Test Case 3): Creating an array with commas separating each object before passing it to `Array.push`.

**Pros and Cons of Each Approach:**

1. **Direct addition**: This approach can be faster because the array is created entirely within the same scope, reducing the overhead of creating a new array object.
	* Pros: Potential for better performance due to reduced object creation overhead.
	* Cons: May lead to slower performance if the array grows too large due to the increased memory allocation.
2. **Array.push without comma**: This approach can be slower because it involves creating a separate array and then passing it to `Array.push`, which adds each element individually.
	* Pros: Easier to understand and maintain, as the intent is clear that an existing array is being modified.
	* Cons: May lead to slower performance due to increased overhead from creating and manipulating arrays.
3. **Array.push with comma**: This approach can be similar to direct addition in terms of performance, but may have additional benefits due to the ability to optimize the array creation process.
	* Pros: Potential for better performance due to optimized array creation, as the commas are used to separate elements in memory.
	* Cons: May lead to slower performance if not optimized correctly.

**Library and Purpose:**

None of the benchmark cases use any external libraries. The `Person` constructor is a simple JavaScript class defined within the script preparation code.

**Special JS Features or Syntax:**

The only special feature used here is the comma operator (`,`) in Test Case 2, which creates an array by separating elements with commas. This syntax can be useful for creating arrays or objects with multiple values.

**Other Considerations:**

* The benchmark measures the execution speed of `Array.push` for different approaches.
* It assumes that the input data is fixed and does not vary between runs, which may not always be the case in real-world scenarios.
* The results are specific to the tested browser and environment, so they may not be representative of other browsers or environments.

**Alternatives:**

Other alternatives for benchmarking array push performance might include:

* Using a different data structure, such as an object or a linked list
* Varying the input data size or shape
* Using multiple threads or concurrent execution to simulate real-world workloads
* Measuring memory allocation and garbage collection overheads separately

Latest run results:

Run details: (Test run date: 6 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.106 Safari/537.36

Browser/OS: Chrome 68 on Mac OS X 10.13.6

View result in a separate tab

Test name	Executions per second
direct addition	296931.3 Ops/sec
Array.push without comma	299300.9 Ops/sec
Array.push with comma	312266.2 Ops/sec

Related benchmarks:

Array.push (version: 8)

Comparing performance of: direct addition vs Array.push without comma vs Array.push with comma

Created: 8 years ago by: Registered User

Jump to the latest result

direct addition

Array.push without comma

Array.push with comma

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 26 days ago):