Benchmark: Math.pow(x,0.5) vs Math.sqrt(x) 12

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 => x **0.5);

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: one year ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/132.0.0.0 Safari/537.36

Browser/OS: Chrome 132 on Windows

View result in a separate tab

Test name	Executions per second
Math.sqrt	37633.7 Ops/sec
sqrt with Math.pow	77474.8 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 benchmark and its components to understand what's being tested.

**Benchmark Definition JSON**

The provided JSON represents a JavaScript microbenchmark named "Math.pow(x,0.5) vs Math.sqrt(x) 12". The main goal of this benchmark is to compare the performance of two different methods for calculating the square root of a number: `Math.pow(x, 0.5)` and `Math.sqrt(x)`.

**Script Preparation Code**

The script preparation code generates an array of 10,000 random numbers using `Array.from(Array(10000), (_,x) => (Math.random()*x))`. This is done to ensure that the benchmark has a consistent input size for both methods being compared.

**Html Preparation Code**

There is no HTML preparation code provided in this example, so we can assume it's not relevant to this specific benchmark.

**Individual Test Cases**

The benchmark defines two individual test cases:

1. `Math.sqrt`: This test case executes the `numbers.forEach(x => Math.sqrt(x));` code.
2. `sqrt with Math.pow`: This test case executes the `numbers.forEach(x => x ** 0.5);` code. Note that this syntax uses the exponentiation operator (`**`) instead of `Math.pow()`. The `**` operator is a relatively new addition to JavaScript (introduced in ECMAScript 2016) and allows for faster exponentiation calculations.

**Pros and Cons**

Let's examine the pros and cons of each approach:

1. **Using Math.sqrt()**: Pros:
	* Widely supported across browsers and platforms.
	* Easy to read and maintain.
Cons:
	* Might be slower due to potential parsing overhead or rounding errors.
2. **Using Math.pow(x, 0.5)**: Pros:
	* Can be faster than `Math.sqrt()` for very large inputs.
	* Offers more control over the calculation (e.g., precision).
Cons:
	* Less readable and less intuitive compared to `Math.sqrt()`.
	* Might require additional checks for zero or negative input values.

**Library Considerations**

There is no specific library mentioned in this benchmark, but some libraries like `Big.js` or `Decimal.js` provide more precise arithmetic operations that can be beneficial for certain applications. However, these libraries are not used in this example.

**Special JS Feature/Syntax**

The `x ** 0.5` syntax uses the exponentiation operator (`**`) to calculate the square root of a number. This is a relatively new addition to JavaScript (introduced in ECMAScript 2016). While it's generally faster than using `Math.pow(x, 0.5)`, it might not be supported by older browsers or platforms.

**Other Alternatives**

If you want to explore alternative approaches for calculating the square root of a number, here are some options:

1. **Newton's method**: This is an iterative algorithm that can be used to approximate the square root of a number. It has better convergence properties than simple exponentiation methods but requires more computational resources.
2. **Binary search**: This method uses a binary search approach to find the integer closest to the desired square root value.

Keep in mind that these alternatives might not be as efficient or readable as using `Math.sqrt()` or `Math.pow(x, 0.5)`.

Related benchmarks:

Math.pow(x,0.5) vs Math.sqrt(x) 12 (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):