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if vs switch case
(version: 0)
Comparing performance of:
switch case vs jump table
Created:
3 years ago
by:
Guest
Go to the latest result
Tests:
switch case
function thing(j) { switch(j) { case 0: case 1: case 2: case 3: return 1; case 10: case 11: case 12: case 13: return 2; case 24: case 25: case 26: case 27: return 3; default: return 0; } } let sum = 0 for(let i = 0; i < 100000; i++) { for(let j = 0; j < 32; j++) { sum += thing(j); } } console.log(sum);
jump table
function thing(j) { if(j == 0) return 1; if(j == 1) return 1; if(j == 2) return 1; if(j == 3) return 1; if(j == 10) return 2; if(j == 11) return 2; if(j == 12) return 2; if(j == 13) return 2; if(j == 24) return 3; if(j == 25) return 3; if(j == 26) return 3; if(j == 27) return 3; return 0; } let sum = 0 for(let i = 0; i < 100000; i++) { for(let j = 0; j < 32; j++) { sum += thing(j); } } console.log(sum);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
switch case
jump table
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
one year ago
)
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/129.0.0.0 Safari/537.36
Browser/OS:
Chrome 129 on Mac OS X 10.15.7
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=559267" width="100%" height="500px"></iframe>
switch case
158/s
jump table
157/s
View exact numbers
Test name
Executions per second
✓
switch case
158 Ops/sec
jump table
157 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the world of JavaScript microbenchmarks! The provided JSON represents two test cases for comparing the performance of `if` statements and switch case statements in JavaScript. **Benchmark Definition:** The benchmark definition is a function named `thing(j)` that takes an integer `j` as input. The function uses both `if` statements and switch case statements to determine the return value based on the value of `j`. There are four cases: * For `j` values 0, 1, 2, or 3, it returns 1. * For `j` values 10, 11, 12, 13, 24, 25, 26, or 27, it returns 2. * For all other cases (including those not explicitly mentioned), it returns 0. **Test Case Options:** The benchmark compares the performance of two options: 1. **Switch Case Statement:** The first test case uses a switch case statement to determine the return value based on the value of `j`. 2. **Jump Table Approach:** The second test case uses a jump table approach, where it uses multiple if-conditional statements to achieve similar functionality. **Pros and Cons:** ### Switch Case Statement: Pros: * Easier to read and maintain due to its concise syntax. * Can be more efficient for small numbers of cases. Cons: * Can lead to slower performance for large numbers of cases or when the number of cases grows rapidly. ### Jump Table Approach: Pros: * Generally provides faster execution times, especially for larger ranges of values. * Allows for easy modification and addition of new case values without affecting existing code. Cons: * More verbose and harder to read due to the need for multiple if-conditional statements. * Can be more error-prone when dealing with edge cases or incorrect case assignments. **Library Considerations:** In this benchmark, there is no explicit mention of any libraries. However, some modern JavaScript implementations (like V8 in Google Chrome) have built-in optimizations and features that can affect the performance of switch statements, such as: * **Switch Table Optimizations:** Modern engines like V8 use precomputed switch tables to improve performance. * **Tail Call Optimization:** Some engines optimize tail calls, which can reduce overhead for recursive functions. **Special JavaScript Features:** There are no special JavaScript features explicitly mentioned in the benchmark. However, some features that might impact performance or optimization include: * **Generator Functions:** While not directly relevant to this benchmark, generator functions can provide additional optimizations for loops and iterations. * **Async/Await Syntax:** This syntax is not directly applicable to this specific benchmark but may be relevant when dealing with asynchronous code. **Other Alternatives:** If you're interested in exploring alternative approaches to switch case statements or jump tables, consider the following options: 1. **Object-Oriented Programming (OOP):** You can use objects and their methods to achieve similar functionality, although this might not be as concise or efficient. 2. **Functional Programming:** Techniques like higher-order functions, currying, or using `Array.prototype.includes()` can provide an alternative to switch statements. 3. **Regex-Based Solutions:** Using regular expressions to match specific patterns can offer a unique approach to handling different cases. For the provided benchmark, if you want to experiment with alternative approaches, consider exploring other options like those mentioned above.
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