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return undefined
(version: 0)
compare 'return undefined;', 'return void 0;' and 'return'
Comparing performance of:
return undefined; vs return void 0; vs return
Created:
3 years ago
by:
Guest
Jump to the latest result
HTML Preparation code:
<script> function ret1(){return undefined;} function ret2(){return void 0;} function ret3(){return;} </script>
Tests:
return undefined;
ret1();
return void 0;
ret2();
return
ret3();
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
return undefined;
return void 0;
return
Fastest:
N/A
Slowest:
N/A
Latest run results:
No previous run results
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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 Overview** The benchmark is designed to compare three different ways of returning values from a function in JavaScript: `return undefined`, `return void 0`, and simply `return`. The test aims to determine which approach results in the fastest execution time. **Options Compared** There are three options being compared: 1. **`return undefined`**: This option returns `undefined`, which is a primitive value in JavaScript. 2. **`return void 0`**: This option returns `void 0`, which is equivalent to `undefined` in modern JavaScript (although it was used in older browsers for backwards compatibility). 3. **`return`** (without an expression): This option simply returns without any value, which might be considered a "noop" or no operation. **Pros and Cons of Each Approach** Here's a brief analysis of each approach: * **`return undefined`**: This is the most straightforward way to return `undefined`. It's a simple and concise syntax. * **`return void 0`**: While this was used in older browsers, it's now largely considered unnecessary and may be removed in future JavaScript versions. In modern browsers, `void 0` is equivalent to `undefined`. * **`return`** (without an expression): This approach returns without any value, which might be seen as inefficient or wasteful. However, some older browsers might optimize this out. **Library Usage** There is no explicit library usage in the provided benchmark definition. However, it's worth noting that modern JavaScript engines often rely on various libraries and frameworks under the hood. **Special JS Features/Syntax** There are no special JS features or syntax mentioned in the benchmark definition. **Other Considerations** When testing this benchmark, consider the following factors: * Browser version: The benchmark results were obtained using Chrome 105. It's essential to test on different browser versions to ensure consistency. * Device platform: The benchmark was run on a desktop device. Testing on mobile devices or other platforms might yield different results. **Alternatives** If you wanted to create similar benchmarks for JavaScript, consider the following alternatives: 1. Compare `null` vs. `undefined`: This could help determine which approach is more efficient. 2. Test `return` with different data types: Experimenting with different data types (e.g., numbers, strings, objects) might reveal performance differences. 3. Use a more comprehensive benchmarking framework: Consider using established frameworks like Benchmark.js or JSPerf to create and run more complex benchmarks. Keep in mind that the specific details of each test case and benchmark can greatly impact the results. Be sure to carefully consider your testing goals and requirements when creating your own JavaScript benchmarks.
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