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for loop length vs length+1
(version: 0)
Comparing performance of:
Set in the loop vs set after the loop
Created:
2 years ago
by:
Guest
Go to the latest result
Tests:
Set in the loop
const dump=[]; const end=100000; for(var i=0; i<end; i++){ dump.push(i); }
set after the loop
const dump=[]; const end=99999; for(var i=0; i<end+1; i++){ dump.push(i); }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
Set in the loop
set after the loop
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
2 years ago
)
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36
Browser/OS:
Chrome 120 on Windows
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<iframe src="https://measurethat.net/Embed?id=492346" width="100%" height="500px"></iframe>
set after the loop
600/s
Set in the loop
589/s
View exact numbers
Test name
Executions per second
✓
set after the loop
600 Ops/sec
Set in the loop
589 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down what's being tested in the provided JSON. **Benchmark Overview** The benchmark is designed to compare two approaches for assigning values to an array `dump` inside a `for` loop: 1. **Set in the loop**: The value is assigned directly within the loop condition (`i < end`). 2. **Set after the loop**: The value is assigned outside the loop, after the loop has completed. **Options Compared** The two options are being compared to determine which one is faster and more efficient. **Pros and Cons of Each Approach** 1. **Set in the loop**: * Pros: Reduced overhead for array push operations since it's done within the loop. * Cons: Potential performance impact due to increased number of loop iterations (due to the condition `i < end`). 2. **Set after the loop**: * Pros: Simplified loop logic, reduced overhead due to fewer loop iterations. * Cons: Increased overhead for array push operations since it's done outside the loop. **Library and Special JS Features** In this benchmark, no libraries are explicitly mentioned or used. However, some special JavaScript features are being utilized: * **Variable `i`**: A common variable name in JavaScript, used to iterate over a range of values. * **Array push**: Used to add elements to the `dump` array. **Other Considerations** When evaluating these two approaches, it's essential to consider factors such as: * Loop iteration count: The number of times the loop runs affects performance. In this case, the first approach might run more iterations due to the condition `i < end`. * Array push overhead: The cost of pushing elements to an array can be significant. By doing it within the loop (approach 1), the overhead is reduced. **Alternatives** Other approaches that could be considered for benchmarking array assignment in a loop include: * Using a different data structure, like `splice()` or `unshift()`, instead of `push()`. * Implementing a custom iterator or generator function to assign values to the array. * Comparing performance using other programming languages or frameworks. Keep in mind that the specific approach and language used can significantly impact the results. This benchmark is designed to test JavaScript-specific aspects, but exploring alternative approaches can provide valuable insights into optimization strategies.
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