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assignment
(version: 0)
ba
Comparing performance of:
smart vs stupid
Created:
7 years ago
by:
Guest
Go to the latest result
Tests:
smart
var x; for(i=0; i<10000; i++){ (x < 0) || (x = i); }
stupid
var x; for(i=0; i<10000; i++){ if (x > -1) { x = i; } }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
smart
stupid
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
one year ago
)
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:138.0) Gecko/20100101 Firefox/138.0
Browser/OS:
Firefox 138 on Windows
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<iframe src="https://measurethat.net/Embed?id=603024" width="100%" height="500px"></iframe>
stupid
74K/s
smart
15K/s
View exact numbers
Test name
Executions per second
✓
stupid
73,666 Ops/sec
smart
14,590 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'll break down the provided benchmark and explain what's being tested, compared, and the pros and cons of different approaches. **Benchmark Definition** The benchmark definition is empty, which means that the script preparation code and HTML preparation code are not required for this specific benchmark. The script only contains a simple loop with conditional statements. **Individual Test Cases** There are two test cases: 1. **"smart"`**: This test case has a single line of code inside the loop: `(x < 0) || (x = i);`. This is an assignment expression, also known as a short-circuit assignment. It's equivalent to `if (x < 0) { x = i; } else { x = -1; }`, but it's more concise and potentially faster because it avoids the overhead of a separate if-else statement. 2. **"stupid"`**: This test case has an if-else statement inside the loop: `if (x > -1) { x = i; }`. This is a more traditional approach to assigning a value to `x` based on some condition. **Comparison of Options** In both test cases, we have two approaches: * **Assignment Expression (Smart)**: `(x < 0) || (x = i);` * **If-Else Statement (Stupid)**: `if (x > -1) { x = i; }` The pros and cons of these options are: **Assignment Expression (Smart)** Pros: * More concise code, which can lead to better performance due to fewer operations. * Can be more readable, especially for simple cases like this one. Cons: * May not work as expected in certain situations, such as when `x` is `-1` and the condition is false. In this case, `x` will remain `-1`. * Not all JavaScript engines support short-circuit assignment expressions (yet!). **If-Else Statement (Stupid)** Pros: * Guaranteed to work in all cases, even when `x` is `-1`. * More readable for some people, as it explicitly states the condition and action. Cons: * Less concise code, which can lead to slower performance due to more operations. * May be less readable for some developers who are used to shorter code. **Library Usage** There is no library mentioned in the provided benchmark definition or test cases. However, if you were to add a library, some options might include: * `mathjs`: A JavaScript library for mathematical operations. If this was used in the benchmark, it could impact performance and readability. * `lodash`: A popular JavaScript utility library that provides various functions, including those related to conditional statements. **Special JS Features/Syntax** There are no special JS features or syntax mentioned in the provided benchmark definition or test cases. However, if you were to add them, some examples might include: * **Arrow Functions**: Used for concise code, but may not be supported by older JavaScript engines. * **Async/Await**: Used for asynchronous code, which can impact performance and readability. **Alternatives** If you're looking for alternatives to MeasureThat.net, consider the following options: 1. **Benchmark.js**: A popular benchmarking library for Node.js. 2. **Benchmark-HighPerformance**: A high-performance benchmarking library for JavaScript. 3. **JSPerf**: A simple benchmarking tool specifically designed for JavaScript. Keep in mind that these alternatives might have different features, ease of use, and performance characteristics compared to MeasureThat.net.
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