Benchmark: Math.pow(x,0.5) 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,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: 19 days ago)

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:149.0) Gecko/20100101 Firefox/149.0

Browser/OS: Firefox 149 on Linux

View result in a separate tab

Test name	Executions per second
Math.sqrt	8045.7 Ops/sec
sqrt with Math.pow	6822.7 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 benchmarking scenario you provided.

**Overview**

The goal of this benchmark is to compare the performance of two mathematical functions: `Math.pow(x, 0.5)` (which calculates the square root of x using exponentiation) and `Math.sqrt(x)` (which directly calculates the square root of x). The test uses a large array of random numbers to stress the JavaScript engine.

**Options Compared**

The benchmark compares two options:

1. **`numbers.forEach(x => Math.pow(x, 0.5))`**: This option uses the `Math.pow()` function with an exponent of 0.5 to calculate the square root of each number in the array.
2. **`numbers.forEach(x => Math.sqrt(x))`**: This option directly uses the `Math.sqrt()` function to calculate the square root of each number in the array.

**Pros and Cons**

* **`Math.pow(x, 0.5)`**:
	+ Pros: This approach is more straightforward and doesn't rely on a specialized square root function.
	+ Cons: Exponentiation can be slower than direct calculation for simple square roots due to the overhead of computing powers.
* **`Math.sqrt(x)`**:
	+ Pros: Directly calculating the square root using a specialized function might be faster, as it's optimized for this specific operation.
	+ Cons: This approach relies on a library function (which might not be available in all JavaScript engines) and requires more complex code.

**Library**

The `Math.sqrt()` function is part of the ECMAScript standard, which means it's supported by most modern JavaScript engines. The `Math.pow(x, 0.5)` function is also an ECMAScript standard, but as mentioned earlier, exponentiation might be slower than direct calculation for simple square roots.

**Special JS Feature/Syntax**

There doesn't appear to be any special JavaScript feature or syntax used in this benchmark. However, it's worth noting that the use of `var` and `Array.from()` with a callback function is consistent with modern JavaScript practice.

**Alternatives**

Other alternatives for measuring performance might include:

* **Using a different mathematical library**: Depending on the specific requirements, other libraries like BigInt or Decimal.js could be used to compare performance.
* **Using a different data structure**: Instead of an array, the benchmark could use another data structure, such as a linked list or a heap, to stress the JavaScript engine.
* **Adding more complex operations**: The benchmark could include additional mathematical operations, such as exponentiation, logarithms, or trigonometric functions, to further stress the JavaScript engine.

Keep in mind that the choice of alternative benchmarks depends on the specific requirements and goals of the project.

Related benchmarks:

Math.pow(x,0.5) vs Math.sqrt(x) (version: 0)

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

Created: 5 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):