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Math.floor vs right shift
(version: 0)
Comparing performance of:
Math.floor vs Right shift
Created:
one year ago
by:
Guest
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Tests:
Math.floor
Math.floor((Math.random() * 10 + 1) / 2) - 1;
Right shift
(Math.random() * 10 - 1) >> 1
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
Math.floor
Right shift
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/128.0.0.0 Safari/537.36
Browser/OS:
Chrome 128 on Windows
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<iframe src="https://measurethat.net/Embed?id=553103" width="100%" height="500px"></iframe>
Right shift
6.9M/s
Math.floor
3.8M/s
View exact numbers
Test name
Executions per second
✓
Right shift
6,857,581 Ops/sec
Math.floor
3,761,690 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'd be happy to explain the provided benchmark. The test measures the performance of two different approaches: `Math.floor` and right shift (`>>`). The goal is to determine which method is faster for a given input. **Approach 1: Math.floor** `Math.floor` is a built-in JavaScript function that returns the largest integer less than or equal to a given number. In this test, it's used with a random value generated using `Math.random()`. The expression `(Math.random() * 10 + 1) / 2 - 1` generates a random integer between -4 and 3. The pros of using `Math.floor` are: * It's a widely supported function in most browsers. * It's easy to understand and implement. * It provides a clear mathematical result. However, the cons are: * For small integers, it may be slower than right shift due to the overhead of the function call. * It can produce fractional results, which might not be desirable in some cases. **Approach 2: Right Shift (`>>`)** Right shift (`>>`) is a bitwise operator that shifts the bits of a number to the right by one position and fills the resulting gap with zeros. In this test, it's used with `Math.random() * 10 - 1`, which generates an integer between -9 and 9. The pros of using right shift are: * It's generally faster than `Math.floor` for small integers. * It provides a bitwise operation, which can be more efficient in some cases. * It doesn't involve function calls or overhead. However, the cons are: * Not all browsers support right shift (`>>`) as a standalone operator. It may require explicit use with an unsigned integer. * The results might not be immediately clear or intuitive for developers who aren't familiar with bitwise operations. In this specific benchmark, `Chrome 128` uses `Math.floor`, while the other browser uses right shift (`>>`). However, it's worth noting that the actual performance difference between these approaches may vary depending on the specific use case and requirements. Other alternatives to consider: * Using a library or utility function: If you need more complex mathematical operations, you might consider using a library like MathJS or MathUtil. These libraries provide a range of mathematical functions and can offer better performance and accuracy. * Optimized implementations: Depending on your specific use case, you might be able to optimize the `Math.floor` implementation further by using assembly language or other low-level techniques. Keep in mind that benchmarking is an art, and results may vary depending on the specific hardware, software, and environment.
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