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Object Literal x Switch - Rocketseat
(version: 0)
https://blog.rocketseat.com.br/substituindo-a-instrucao-switch-por-object-literal/
Comparing performance of:
Switch vs Object Literal
Created:
5 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
var today = new Date().getDay()
Tests:
Switch
let day; switch (today) { case 0: day = "Sunday"; break; case 1: day = "Monday"; break; case 2: day = "Tuesday"; break; case 3: day = "Wednesday"; break; case 4: day = "Thursday"; break; case 5: day = "Friday"; break; case 6: day = "Saturday"; break; default: throw new Error("Hey! We have only 7 days in the week"); } console.log(`What day of the week is today? ${day}`);
Object Literal
const dayOfTheWeek = { 0: "Sunday", 1: "Monday", 2: "Tuesday", 3: "Wednesday", 4: "Thursday", 5: "Friday", 6: "Saturday", }; console.log( `What day of the week is today? ${dayOfTheWeek[today]}` );
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
Switch
Object Literal
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Measuring JavaScript performance is crucial for optimizing code, and MeasureThat.net provides an excellent platform for benchmarking. I'll break down the provided JSON, explaining what's tested, the options compared, their pros and cons, and other considerations. **Benchmark Definition** The benchmark definition represents a piece of code that defines a test case. In this case, there are two test cases: 1. **Switch**: This test case uses a traditional `switch` statement to determine the day of the week. 2. **Object Literal**: This test case uses an object literal to achieve the same result. **Options Compared** The two options compared are: * Traditional `switch` statement * Object literal (an object with numerical keys) **Pros and Cons** 1. **Switch Statement**: * Pros: readable, widely supported, and easy to understand. * Cons: can be slower than other approaches due to the overhead of evaluating conditions and jumping between cases. 2. **Object Literal**: * Pros: concise, efficient, and can be faster since it avoids the overhead of condition evaluation. * Cons: might require more mental effort to read and understand, especially for those unfamiliar with this approach. **Library Usage** None of the test cases explicitly use any external libraries. **Special JS Features or Syntax** There is no special JavaScript feature or syntax used in these test cases. They are straightforward examples of using `switch` statements and object literals. **Other Considerations** When comparing the performance of these two approaches, other factors come into play: * **Readability**: The choice between a traditional `switch` statement and an object literal affects code readability. * **Maintainability**: If you're working on a team or need to modify the codebase in the future, using an object literal might require more effort due to its concise nature. * **Performance Impact**: While object literals can be faster, this difference is usually negligible unless performance is critical. **Alternatives** Other alternatives for determining the day of the week could include: * Using a lookup table (similar to the object literal approach) * Utilizing the `Date` object's built-in methods (e.g., `getDay()`, `toLocaleString()`) * Employing a mathematical formula to calculate the day of the week * Using a third-party library or module for date calculations Keep in mind that these alternatives might introduce additional dependencies, complexity, or performance overhead. In conclusion, MeasureThat.net provides an excellent platform for comparing the performance of traditional `switch` statements and object literals. By considering factors like readability, maintainability, and performance impact, developers can make informed decisions about which approach to use depending on their specific needs and priorities.
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