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Dividing by 2 and flooring the result vs unshifting 1
(version: 0)
Comparing performance of:
floor divide vs unshift
Created:
2 years ago
by:
Registered User
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Tests:
floor divide
console.log(Math.floor(37 / 2))
unshift
console.log(37 >> 1)
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
floor divide
unshift
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/126.0.0.0 Safari/537.36
Browser/OS:
Chrome 126 on Windows
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<iframe src="https://measurethat.net/Embed?id=531886" width="100%" height="500px"></iframe>
Test name
Executions per second
floor divide
373371.5 Ops/sec
unshift
378810.7 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark definition and test cases to understand what is being tested. **Benchmark Definition** The benchmark definition provides two different approaches for performing division and flooring: `Math.floor(37 / 2)` and `37 >> 1`. Both approaches aim to divide 37 by 2 and then round down to the nearest integer using the floor function. However, they differ in their implementation: * The first approach uses the traditional division operator `/` followed by the `Math.floor()` function. * The second approach uses the right shift operator `>>`, which is a bitwise operation that shifts the bits of the number 37 to the right by 1 position. **Options Compared** The two options are compared in terms of performance, and the benchmark aims to determine which one is faster on average. This comparison can help identify any potential performance issues or optimizations in the JavaScript engine. **Pros and Cons** Here's a brief analysis of each option: * **Traditional Division with Math.floor()** + Pros: Easy to understand, well-documented, and widely supported. + Cons: May be slower than alternative approaches due to the overhead of the `Math.floor()` function call. * **Right Shift Operator (`>>`)** + Pros: Can be faster than traditional division for certain types of data (e.g., integers) because it's a bitwise operation, which can take advantage of CPU optimizations. However, this comes with limitations since not all numbers can be efficiently represented as binary. + Cons: May be less intuitive or harder to understand compared to the traditional division approach. **Other Considerations** When evaluating these options, consider factors like: * Code readability and maintainability * Platform support (e.g., is the right shift operator supported across different browsers and platforms?) * Performance optimization strategies (e.g., using SIMD instructions or other CPU-specific optimizations) **Library Usage** Neither of the provided benchmark definitions uses a specific library. However, it's worth noting that in real-world applications, you might use libraries like `mathjs` for mathematical operations or `bitwise` for bitwise operations. **Special JS Feature/ Syntax** The benchmark definition doesn't explicitly mention any special JavaScript features or syntax (e.g., async/await, generators). If you're concerned about using such features, ensure that your testing environment supports them and consider how they might impact performance in this specific benchmark. Other Alternatives When creating benchmarks, you can explore other alternatives to measure execution time: * Using a profiling tool like Chrome DevTools' Performance tab or Node.js's built-in `v8 Inspector` * Writing tests using a testing framework (e.g., Jest, Mocha) and measuring the execution time of each test case * Comparing different versions of JavaScript engines or browsers to see if any optimization changes affect performance
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