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switch vs if
(version: 0)
Comparing performance of:
switch vs if
Created:
7 years ago
by:
Guest
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HTML Preparation code:
<div class="test"></div>
Script Preparation code:
var v = 0 | Math.random() * 3 + 1; // 1, 2, or 3
Tests:
switch
switch (v) { case 1: break; case 2: break; case 3: break; default: ; }
if
if (v === 1) { } else if (v === 2) { } else if (v === 3) { } else { }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
switch
if
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
**What is being tested?** MeasureThat.net is testing the performance of two JavaScript constructs: `if` statements and `switch` statements. The benchmark is comparing the execution time of these two approaches to determine which one is faster. **Options compared** The benchmark is comparing the following options: 1. **If-else chain**: A series of `if` statements that check different conditions in sequence. 2. **Switch statement**: A single `switch` statement with multiple cases, each handling a specific condition. **Pros and Cons** **If-Else Chain:** Pros: * Easy to understand and maintain * Can be used for complex logic Cons: * Can lead to performance issues if the chain is deep or has many branches * Requires more CPU cycles due to the sequential checking of conditions **Switch Statement:** Pros: * More efficient than an if-else chain, especially for multiple cases with similar code * Reduces the number of comparisons required Cons: * Can be harder to understand and maintain, especially for complex logic * May require additional space on the stack due to the switch table **Other Considerations** When using a `switch` statement, it's essential to consider the following: * **Case values**: The values used in the `case` statements should be distinct and not overlap with other cases. * **Fallthrough behavior**: If you want certain code to execute when a case is matched, use the `break` keyword to prevent fallthrough. **Library usage** There doesn't seem to be any library being used in this benchmark. The scripts are simple JavaScript expressions that don't rely on external libraries or frameworks. **Special JS features or syntax** This benchmark uses the following feature: * **Template literals**: The `Script Preparation Code` includes a template literal (`var v = 0 | Math.random() * 3 + 1;`) to generate a random integer value. This is used to create a dynamic test case for the switch and if statements. **Other alternatives** If you wanted to write this benchmark, you could also consider using other approaches, such as: * **Use cases**: Create multiple use cases that exercise different parts of each construct. * **Array-based testing**: Use arrays to generate random values and test the performance of both constructs on these inputs. * **Profiling tools**: Utilize profiling tools like WebPerformance API or Chrome DevTools' Profiler to measure the execution time of both constructs. These alternatives can provide additional insights into the performance characteristics of `if` statements and switch statements in JavaScript.
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