Benchmark: Testering - MeasureThat.net

Tests:

case 1
let x = Array.from({length: 200}, () => Math.random() * 100); x.map((y) => Math.abs(Math.sign(y)))
case 2
let x = Array.from({length: 200}, () => Math.random() * 100); x.map((y) => y > 0 ? 1 : 0)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
case 1
case 2

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:126.0) Gecko/20100101 Firefox/126.0

Browser/OS: Firefox 126 on Windows

View result in a separate tab

Test name	Executions per second
case 1	126555.1 Ops/sec
case 2	149116.7 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.

**Benchmark Definition**

The benchmark definition is a JavaScript code snippet that creates an array of random numbers between 0 and 100, maps over it to apply a transformation, and then executes this code.

There are two test cases:

1. `case 1`: Maps the absolute value of each number using `Math.abs(Math.sign(y))`. This means that any negative number will be mapped to its positive equivalent.
2. `case 2`: Maps the numbers to either 0 or 1 based on whether the number is greater than 0.

**Options Compared**

The benchmark tests two different mapping approaches:

1. **`Math.abs(Math.sign(y))`**: This approach uses the `Math.sign()` function, which returns `-1`, `0`, or `1` depending on the sign of its input.
2. **`y > 0 ? 1 : 0`**: This is a simple conditional statement that checks if the number is greater than 0 and returns either `1` or `0`.

**Pros and Cons**

Both approaches have their advantages and disadvantages:

* **`Math.abs(Math.sign(y))`**:
	+ Pros: More concise and expressive, as it directly maps negative numbers to their positive equivalents.
	+ Cons: May be slower due to the additional function call and operation.
* **`y > 0 ? 1 : 0`**:
	+ Pros: Faster, as it's a simple arithmetic comparison.
	+ Cons: More verbose and less expressive, requiring an explicit conditional statement.

**Library**

None of the test cases use any libraries.

**Special JavaScript Feature or Syntax**

The `Math.sign()` function is a relatively recent addition to JavaScript, introduced in ECMAScript 2015 (ES6). It's designed to provide a more concise way to determine the sign of a number without using explicit conditional statements. While it's not specific to this benchmark, its use demonstrates the evolving nature of JavaScript.

**Other Considerations**

When comparing these two approaches, consider the following factors:

* Code readability: `Math.abs(Math.sign(y))` is generally considered more concise and readable.
* Performance: The first approach might be slower due to the additional function call and operation. However, this difference is likely negligible for most use cases.
* Maintainability: Using a library or built-in function like `Math.sign()` can make code more maintainable by reducing the need for explicit conditional statements.

**Alternatives**

Other alternatives could include:

1. Using other mapping functions, such as `y => (y > 0) ? 1 : 0` (without `Math.sign()`)
2. Implementing a custom mapping function using bitwise operations or arithmetic
3. Using libraries like Lodash or Ramda for more complex transformations

Keep in mind that the choice of approach depends on the specific use case, performance requirements, and personal preference.

I hope this explanation helps!

Related benchmarks:

Testering (version: 0)

Comparing performance of: case 1 vs case 2

Created: one year ago by: Guest

Jump to the latest result

case 1

case 2

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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