Benchmark: negative to positive number

Script Preparation code:

var x = -5

Tests:

Math.abs(x)
Math.abs(x)
x *= -1
x *= -1
x=-x
x=-x

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Math.abs(x)
x *= -1
x=-x

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (Linux; Android 11; Mi Note 10 Lite) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/98.0.4758.101 Mobile Safari/537.36

Browser/OS: Chrome Mobile 98 on Android

View result in a separate tab

Test name	Executions per second
Math.abs(x)	1744941.2 Ops/sec
x *= -1	2452646.5 Ops/sec
x=-x	2457162.0 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):

LLMs can make mistakes. Check important info.

Let's break down the provided benchmarking data and explain what's being tested, compared, and considered.

**Benchmark Definition JSON**

The provided JSON represents a basic benchmark definition template. Here's a breakdown of its components:

* `Name`: The name of the benchmark, which is "negative to positive number".
* `Description`: An empty string, indicating no description for this benchmark.
* `Script Preparation Code`: A JavaScript code snippet that initializes the variable `x` with a value of `-5`. This code is executed before running each test case.
* `Html Preparation Code`: Another empty string, indicating no HTML preparation code is needed.

**Individual Test Cases**

The JSON also contains three individual test cases, each defined by:

* `Benchmark Definition`: A JavaScript expression to be evaluated, e.g., "Math.abs(x)".
* `Test Name`: The name of the test case, which matches the benchmark definition expression.

These test cases are designed to measure the performance of various arithmetic operations on a single variable `x`.

**Comparison Options**

The three test cases compare different approaches to perform the same operation:

1. **`Math.abs(x)`**: Uses the built-in `abs()` method from the Math library to calculate the absolute value of `x`.
2. **`x *= -1`**: Multiplies the current value of `x` by `-1`, effectively negating it.
3. **`x=-x`**: Assigns the negative value of `x` to `x`.

**Pros and Cons**

Here's a brief analysis of each approach:

* **`Math.abs(x)`**:
	+ Pros: Efficient, well-documented, and widely supported.
	+ Cons: May not be as educational or illustrative as other approaches.
* **`x *= -1`**: A simple, straightforward way to negate `x`. However, it may not be immediately clear why this is done instead of using `Math.abs(x)`.
* **`x=-x`**: This approach can be seen as more " manual" or " educational", as it demonstrates the concept of negating a value. However, it's less efficient and may require explicit handling of potential NaN (Not a Number) values.

**Library: Math**

The `Math` library is a built-in JavaScript library that provides various mathematical functions, including `abs()`. This library is widely supported across different browsers and platforms, making it a reliable choice for benchmarking purposes.

**Special JS Feature/Syntax: none**

None of the test cases use special or advanced JavaScript features beyond basic arithmetic operations. The expressions are straightforward and easily understandable.

**Alternatives**

If you were to create alternative benchmarks, you might consider adding more complex expressions or operations that take advantage of other language features, such as:

* **`x^2`**: Calculates the square of `x`.
* **`Array.prototype.forEach()`**: Iterates over an array using a `forEach` loop.
* **`String.prototype.replace()`**: Replaces substrings in a string.

Keep in mind that adding more complex benchmarks may require additional consideration for factors like code readability, maintainability, and performance.

Related benchmarks:

negative to positive number (version: 0)

Comparing performance of: Math.abs(x) vs x *= -1 vs x=-x

Created: 3 years ago by: Guest

Jump to the latest result

Math.abs(x)

x *= -1

x=-x

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):