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switch case vs object (string as key)
(version: 0)
Comparing performance of:
switch case vs object
Created:
2 years ago
by:
Guest
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Tests:
switch case
const roleIndex = 'abcd'; let role; switch(roleIndex) { case 'abcd': role = 'admin'; break; case 'efgh': role = 'moderator'; break; default: role = 'user'; }
object
const roleIndex = 'abcd'; const role = { abcd: 'admin', efgh: 'moderator' }[roleIndex] ?? 'user';
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
switch case
object
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
6 months ago
)
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/143.0.0.0 Safari/537.36
Browser/OS:
Chrome 143 on Windows
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<iframe src="https://measurethat.net/Embed?id=623685" width="100%" height="500px"></iframe>
switch case
207.6M/s
object
185.6M/s
View exact numbers
Test name
Executions per second
✓
switch case
207,604,512 Ops/sec
object
185,641,536 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark and explain what's being tested. **Benchmark Purpose:** The benchmark is designed to compare the performance of two approaches: traditional `switch` statements and object-based lookups (using the bracket notation). **Options Compared:** There are two main options being compared: 1. **Switch Statement:** The first option uses a traditional `switch` statement with multiple cases to determine the value of the `role` variable. 2. **Object-Based Lookup:** The second option uses an object-based approach, where an object is created with string keys and values for each role, and then the value is retrieved using the bracket notation (`[key] ?? 'user'`). **Pros and Cons:** * **Switch Statement:** + Pros: - Easy to understand and maintain - Can be more readable for simple cases + Cons: - Can lead to performance issues with many cases due to the overhead of jumping between cases - May not be suitable for large numbers of cases or complex logic * **Object-Based Lookup:** + Pros: - More efficient and scalable, especially for larger objects or more complex logic - Can reduce the number of jumps between cases, resulting in better performance + Cons: - May require more boilerplate code (e.g., object creation, bracket notation) - Less readable than traditional `switch` statements for simple cases **Library and Syntax:** In both benchmark definitions, there are no external libraries used. However, the syntax used is specific to JavaScript. **Special Features/Syntax:** * **Optional Chaining (??):** The object-based lookup uses the optional chaining operator (`?.`) which was introduced in ECMAScript 2020. It allows for safe navigation and avoidance of null pointer exceptions. * **Bracket Notation:** The object-based lookup also uses the bracket notation (`[key] ?? 'value'`) to retrieve values from an object. This syntax is also part of ECMAScript. **Other Alternatives:** For similar benchmarks, consider testing: 1. **Regular Expressions:** Using regular expressions to match and extract values. 2. **Array-Based Lookup:** Using arrays with index-based lookup. 3. **Function-Based Approach:** Using functions to perform the logic instead of traditional `switch` statements or object-based lookups. These alternatives can provide different perspectives on performance, readability, and maintainability for similar use cases.
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