Benchmark: Add value to an array

Script Preparation code:

var aNumbers = [1,2,3,4];
var aNumbersLenght = aNumbers.lenght;

Tests:

Push
aNumbers.push(5);
Index
aNumbers[aNumbersLenght] = 5;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Push
Index

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36

Browser/OS: Chrome 131 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Push	15224891.0 Ops/sec
Index	8031907.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what's being tested.

**What is being tested?**

The main goal of this benchmark is to compare two approaches for adding a value to an array in JavaScript: using the `push()` method and using indexing (i.e., accessing an element at a specific index).

**Options compared:**

There are two options being compared:

1. **Push**: Using the `push()` method, which adds one or more elements to the end of the array.
2. **Index**: Using indexing to access an element in the array and assigning a new value.

**Pros and Cons of each approach:**

* **Push**:
	+ Pros:
		- Easy to use and understand.
		- Modifies the original array.
	+ Cons:
		- Can be less efficient for large arrays since it involves shifting elements when inserting at the end.
* **Index**:
	+ Pros:
		- More flexible, as you can access any element in the array.
		- May be more efficient for small to medium-sized arrays since it avoids the overhead of shifting elements.
	+ Cons:
		- Requires manual indexing, which can lead to errors if not done correctly.

**Library:**

There doesn't appear to be a specific library being used in this benchmark. However, some libraries like Lodash or Ramda provide utility functions for array operations, including `push()` and indexing.

**Special JS feature/syntax:**

This benchmark does not use any special JavaScript features or syntax that are not widely supported. The focus is on comparing the performance of two fundamental array operations in JavaScript.

**Other alternatives:**

In addition to these two approaches, other methods for adding a value to an array include:

* Using `concat()` and spreading the new element (`aNumbers.concat(5)`)
* Using `setInterval` or another timing-based approach
* Using a different data structure, such as a linked list or a tree

However, these alternatives are not being compared in this benchmark.

**Benchmark preparation code:**

The provided script preparation code creates an array `aNumbers` with initial values and calculates its length. The index of the last element is stored in the variable `aNumbersLenght`.

In the HTML preparation code, no additional code is required since this is a JavaScript-only benchmark.

Let me know if you have any further questions or need clarification on any aspect of the benchmark!

Related benchmarks:

Add value to an array (version: 1)

Two ways of a add value to an array.

Comparing performance of: Push vs Index

Created: 9 years ago by: Registered User

Jump to the latest result

Push

Index

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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