Benchmark: Math.pow(x,0.5) vs Math.sqrt(x) vs (x ** 0.5) reduce sum

Script Preparation code:

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

Tests:

Math.sqrt
const sum = numbers.map(number => Math.sqrt(number)).reduce((a, b) => a + b, 0) console.log(sum)
sqrt with Math.pow
const sum = numbers.map(number => Math.pow(number, 0.5)).reduce((a, b) => a + b, 0) console.log(sum)
sqrt with ** 0.5
const sum = numbers.map(number => number ** 0.5).reduce((a, b) => a + b, 0) console.log(sum)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Math.sqrt
sqrt with Math.pow
sqrt with ** 0.5

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 11 months ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:128.0) Gecko/20100101 Firefox/128.0

Browser/OS: Firefox 128 on Windows

View result in a separate tab

Test name	Executions per second
Math.sqrt	7274.3 Ops/sec
sqrt with Math.pow	7069.5 Ops/sec
sqrt with ** 0.5	8959.1 Ops/sec

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

LLMs can make mistakes. Check important info.

**What is being tested?**

MeasureThat.net is testing the performance of three different methods to calculate the square root of a number in JavaScript: `Math.sqrt`, `Math.pow(x, 0.5)`, and `(x ** 0.5)`. The test cases are comparing the execution time of these methods on an array of random numbers.

**Options compared**

The three options being compared are:

1. `Math.sqrt`: a built-in JavaScript method to calculate the square root of a number.
2. `Math.pow(x, 0.5)`: a method that uses the power operator (`**`) to raise the input number `x` to the power of 0.5.
3. `(x ** 0.5)`: an alternative syntax that achieves the same result as `Math.pow(x, 0.5)`.

**Pros and cons of each approach**

1. `Math.sqrt`:
	* Pros: concise, readable, and widely supported.
	* Cons: may be less efficient than other methods due to its implementation in the JavaScript engine.
2. `Math.pow(x, 0.5)`: 
	* Pros: can be more efficient than `Math.sqrt` for some cases, as it avoids the overhead of a function call.
	* Cons: requires explicit exponentiation, which can make the code less readable.
3. `(x ** 0.5)`:
	* Pros: concise and expressive, as it directly conveys the intention to calculate the square root.
	* Cons: may not be supported by older JavaScript engines or browsers.

**Library usage**

None of the test cases explicitly use any libraries beyond the standard JavaScript library.

**Special JS feature or syntax**

There are no special features or syntaxes used in these test cases. The code is straightforward and uses only basic JavaScript operators and functions.

**Other alternatives**

If you wanted to explore alternative methods for calculating square roots, some options might include:

1. Using a library like `sqrt` from the `mathjs` library, which provides an optimized implementation of the square root function.
2. Implementing your own square root algorithm using numerical methods, such as Newton's method or the Babylonian method.
3. Using a different mathematical function, such as the `acosh` function from the `mathjs` library, which calculates the inverse hyperbolic cosine (equivalent to the square root of x + 1).

Keep in mind that these alternatives may have different performance characteristics and trade-offs, depending on the specific use case and requirements.

Related benchmarks:

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

Comparing performance of: Math.sqrt vs sqrt with Math.pow vs sqrt with ** 0.5

Created: 2 years ago by: Registered User

Jump to the latest result

Math.sqrt

sqrt with Math.pow

sqrt with ** 0.5

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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