Toggle navigation
MeasureThat.net
Create a benchmark
Tools
Feedback
FAQ
Register
Log In
negative to positive number
(version: 0)
Comparing performance of:
Math.abs(x) vs x *= -1 vs x=-x
Created:
4 years ago
by:
Guest
Jump to the latest result
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>
Run tests (3)
Previous results
Fork
Test case name
Result
Math.abs(x)
x *= -1
x=-x
Fastest:
N/A
Slowest:
N/A
Latest run results:
No previous run results
This benchmark does not have any results yet. Be the first one
to run it!
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
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:
Math.sign speed
Negate Number
Math.abs speed vs multiply full example
Negatives
Comments
Confirm delete:
Do you really want to delete benchmark?