Benchmark: taw69420 - MeasureThat.net

Tests:

good
Array(500)
bad
Array.from({length:500})

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
good
bad

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 17_2_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.2 Mobile/15E148 Safari/604.1

Browser/OS: Mobile Safari 17 on iOS 17.2.1

View result in a separate tab

Test name	Executions per second
good	1512984.4 Ops/sec
bad	752580.6 Ops/sec

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

LLMs can make mistakes. Check important info.

I'd be happy to explain what's being tested in the provided benchmark.

**Benchmark Overview**

The test cases are designed to measure the performance difference between two approaches to creating an array of size 500: using the `Array` constructor versus the `Array.from()` method.

**What is being compared?**

* **Approach 1:** Using the `Array` constructor (`new Array(500)`).
	+ Pros:
		- Simple and well-known syntax.
		- Allows for easy manipulation of array properties (e.g., setting length, indexing).
	+ Cons:
		- Can be slower than other approaches due to the overhead of creating a new object.
* **Approach 2:** Using the `Array.from()` method (`Array.from({length: 500})`).
	+ Pros:
		- Faster and more efficient than the `Array` constructor.
		- Allows for creation of arrays from existing data structures (e.g., objects, sets).
	+ Cons:
		- Requires a modern JavaScript environment that supports `Array.from()`.
		- Less intuitive syntax compared to `Array` constructor.

**Why is this comparison important?**

Performance optimization is crucial in many web applications, and understanding the differences between various array creation methods can help developers make informed decisions about their code. By testing these two approaches, the benchmark aims to identify which one is faster and more efficient.

**Library Usage**

There is no explicit library usage mentioned in the provided code snippet. However, it's worth noting that `Array.from()` was introduced in ECMAScript 2015 (ES6), so any older JavaScript environments may not support this method.

**Special JS Features or Syntax**

There are no special JS features or syntax used in this benchmark beyond the standard array creation methods mentioned earlier.

**Other Alternatives**

For creating arrays, other alternatives to `Array` and `Array.from()` include:

* **`new Int8Array()`, `new Uint8Array()`, etc.**: These methods create typed arrays (arrays with a specific data type) that offer better performance for certain use cases.
* **`[...Array(size)]```**: This method creates an array by repeating the value 0, n times (where n is the size). While similar to `new Array(size)`, it may be slightly faster due to its inline assembly implementation.
* **Native array literals** (e.g., `[1, 2, 3]`): For small arrays, native literals can be as fast or even faster than using constructors.

Keep in mind that the performance differences between these alternatives can vary depending on the specific use case and JavaScript environment.

Related benchmarks:

taw69420 (version: 0)

Comparing performance of: good vs bad

Created: 2 years ago by: Registered User

Jump to the latest result

good

bad

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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