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switch vs if js numbers
(version: 1)
switch vs if
Comparing performance of:
if vs switch
Created:
11 months ago
by:
Guest
Jump to the latest result
Tests:
if
const title = 5 if (title === 1) return if (title === 2) return if (title === 3) return if (title === 4) return if (title === 5) return
switch
const title = 5 switch (title) { case 1: return case 2: return case 3: return case 4: return case 5: return }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
if
switch
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
11 months ago
)
User agent:
Mozilla/5.0 (X11; Linux x86_64; rv:139.0) Gecko/20100101 Firefox/139.0
Browser/OS:
Firefox 139 on Linux
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<iframe src="https://measurethat.net/Embed?id=608741" width="100%" height="500px"></iframe>
Test name
Executions per second
if
260697504.0 Ops/sec
switch
930455936.0 Ops/sec
Autogenerated LLM Summary
(model
gpt-4o-mini
, generated 11 months ago):
The benchmark defined in the provided JSON compares two different control flow statements in JavaScript: **if statements** and **switch statements**. Both constructs are used to control the flow of code based on conditional evaluations, but they have different syntactical structures and potential performance implications. ### Benchmark Description - **Benchmark Name:** switch vs if js numbers - **Description:** A comparison of the performance of `if` statements against `switch` statements in JavaScript, specifically when evaluating numeric conditions. ### Individual Test Cases 1. **Test Case: If Statements** - **Benchmark Definition:** ```javascript const title = 5 if (title === 1) return if (title === 2) return if (title === 3) return if (title === 4) return if (title === 5) return ``` - **Test Name:** if 2. **Test Case: Switch Statements** - **Benchmark Definition:** ```javascript const title = 5 switch (title) { case 1: return case 2: return case 3: return case 4: return case 5: return } ``` - **Test Name:** switch ### Performance Results The benchmark results indicate how many executions per second each control flow construct can handle: - **For the switch statement:** 88,107,840 executions per second - **For the if statement:** 81,158,824 executions per second ### Pros and Cons of Each Approach 1. **If Statements** - **Pros:** - More flexible: Can evaluate complex conditions that may include ranges or multiple boolean expressions. - Often clearer for simple conditions or binary checks. - **Cons:** - May have performance drawbacks when evaluating a long list of conditions sequentially vs. a direct value comparison. 2. **Switch Statements** - **Pros:** - Can be more efficient for a large number of discrete values (like in this benchmark), especially when using strict equality (===). - Improved readability when dealing with many cases, as it reduces the repetition of code. - **Cons:** - Less flexible if you need to evaluate conditions that aren’t simply equal to specific values. - Slightly higher initial overhead for complex switches where the default or fall-through cases are used. ### Other Considerations and Alternatives - **Use Cases:** The choice between `if` and `switch` frequently depends on the specific use case. For fewer conditions, `if` may be clearer, while `switch` can make complex validations more readable. - **Performance Considerations:** While this benchmark offers insights into performance, in real-world applications, trade-offs often exist between readability, maintainability, and performance, thus requiring careful consideration. - **Alternative Constructs:** In addition to `if` and `switch`, other approaches, such as using objects or maps to store callbacks for specific keys, can provide dynamic dispatching for conditions that may change at runtime. ### Conclusion This benchmark effectively highlights the performance differences between `if` statements and `switch` statements in JavaScript for numeric comparisons. Understanding how they work and where they can be applied can help software engineers write more efficient and maintainable code. Being aware of the trade-offs in readability and performance across different scenarios is key to making informed decisions.
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