Benchmark: Math.pow(x,2) vs Math.sqrt(x)

Script Preparation code:

var numbers = Array.from(Array(10000), (_,x) => (Math.random()*x));

Tests:

Math.sqrt
numbers.forEach(x => Math.sqrt(x));
sqrt with Math.pow
numbers.forEach(x => Math.pow(x,2));

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Math.sqrt
sqrt with Math.pow

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.2.1 Safari/605.1.15

Browser/OS: Safari 17 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Math.sqrt	1565.6 Ops/sec
sqrt with Math.pow	1621.5 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, compared, and analyzed.

**What is being tested?**

The benchmark measures the performance of two different ways to calculate the square root of numbers: `Math.sqrt` and using `Math.pow(x, 2)`. The test case generates an array of 10,000 random numbers and uses `forEach` to apply each calculation on the array.

**Options compared**

The main options being compared are:

1. **`Math.sqrt`**: This method calculates the square root directly.
2. **Using `Math.pow(x, 2)`**: This method uses the power operator (`^`) to calculate the square of a number and then takes the square root by dividing by 2.

**Pros and cons**

* **`Math.sqrt`**:
	+ Pros: Generally faster and more efficient, as it directly calculates the square root without additional calculations.
	+ Cons: May not be available in older browsers or environments that don't support modern math functions.
* **Using `Math.pow(x, 2)`**:
	+ Pros: More widely supported across different browsers and environments, as it's a basic arithmetic operation.
	+ Cons: Generally slower than using `Math.sqrt` due to the additional calculations required.

**Library usage**

There is no explicit library mentioned in the benchmark definition or test cases. However, if we look at the JavaScript engine implementations (e.g., V8 for Chrome), they typically provide optimized implementations of math functions like `sqrt`.

**Special JS feature or syntax**

The benchmark doesn't explicitly use any special JavaScript features or syntax beyond standard ES6+ syntax and built-in methods.

**Other alternatives**

If you were to modify the benchmark, you might consider adding more test cases, such as:

* Using other mathematical libraries (e.g., MathJax) for comparison.
* Incorporating older browsers' implementations of math functions for compatibility testing.
* Experimenting with different array sizes or data distributions to see how performance scales.

Keep in mind that this is just a starting point, and the scope of alternatives will depend on your specific testing goals.

Related benchmarks:

Math.pow(x,2) vs Math.sqrt(x) (version: 0)

Comparing performance of: Math.sqrt vs sqrt with Math.pow

Created: 2 years ago by: Guest

Jump to the latest result

Math.sqrt

sqrt with Math.pow

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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