Benchmark: Math.pow vs ** vs sqrt

Tests:

pow
var tmp = Math.pow(Math.random(), 0.5);
**
var tmp = Math.random() ** 0.5;
sqrt
var tmp = Math.sqrt(Math.random());

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
pow
**
sqrt

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.36 OPR/107.0.0.0

Browser/OS: Opera 107 on Windows

View result in a separate tab

Test name	Executions per second
pow	4793266.5 Ops/sec
**	8741974.0 Ops/sec
sqrt	4644485.0 Ops/sec

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

LLMs can make mistakes. Check important info.

I'll break down the benchmark and explain what's being tested, along with the pros and cons of each approach.

**Benchmark Overview**

The MeasureThat.net benchmark compares the performance of three different ways to calculate the square root of a random number: `Math.pow`, exponentiation (`**`), and the built-in `sqrt()` function from the Math library. The benchmark is designed to test the execution speed of these three approaches on various browsers.

**Options Compared**

The two main options being compared are:

1. **`Math.pow`**: This method uses the power operator (`^`) to calculate the square root.
2. **Exponentiation (`**`)**: This method uses a custom syntax, `x ** y`, which is equivalent to `Math.pow(x, y)`.

Pros and Cons of each approach:

* **`Math.pow`**:
	+ Pros: Wide browser support, easy to implement.
	+ Cons: Can be slower than exponentiation due to the overhead of calculating powers.
* **Exponentiation (`**`)**:
	+ Pros: Fast execution speed, potentially faster than `Math.pow`.
	+ Cons: Requires a custom syntax, may not work in all browsers.

**Library and Syntax Used**

The benchmark uses the built-in `sqrt()` function from the Math library to calculate the square root. This is not explicitly mentioned in the JSON data, but it's implied as part of the benchmark setup.

**Special JS Feature or Syntax**

Exponentiation (`**`) is a feature introduced in ECMAScript 2016 (ES6) that allows for a custom syntax for exponentiation. The use of `x ** y` to calculate the square root is equivalent to `Math.pow(x, y)` but provides a more concise and readable way to express the calculation.

**Other Considerations**

When writing benchmarks like this one, it's essential to consider factors such as:

* **Browser support**: Different browsers may have varying levels of support for certain features or functions.
* **Cache effects**: Benchmarks that measure execution speed can be affected by caching, where previous results are stored in memory and reused instead of recalculated.
* **Randomization**: Random numbers can be used to simulate a variety of input scenarios, but this can also introduce variability in the benchmark results.

**Alternatives**

Other alternatives for calculating square roots might include:

* Using `Math.sqrt()` with a library like `lodash` or `Math.js`, which provides additional mathematical functions.
* Implementing a custom square root function using bitwise operations or other algorithms.
* Using a different data structure, such as an array of pre-computed square roots, to cache results and reduce execution time.

Keep in mind that the choice of alternative will depend on the specific requirements and constraints of the project.

Related benchmarks:

Math.pow vs ** vs sqrt (version: 0)

Comparing performance of: pow vs ** vs sqrt

Created: 4 years ago by: Guest

Jump to the latest result

pow

**

sqrt

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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