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Math.pow vs ** vs sqrt
(version: 0)
Comparing performance of:
pow vs ** vs sqrt
Created:
5 years ago
by:
Guest
Go to the latest result
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>
Run tests (3)
Previous results
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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
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=513920" width="100%" height="500px"></iframe>
**
8.7M/s
pow
4.8M/s
sqrt
4.6M/s
View exact numbers
Test name
Executions per second
✓
**
8,741,974 Ops/sec
pow
4,793,266 Ops/sec
sqrt
4,644,485 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
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.
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