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Index vs slice
(version: 0)
Comparing performance of:
Index vs Slice
Created:
4 years ago
by:
Guest
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Script Preparation code:
var DATA = 'Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer semper sed est ut sollicitudin. Curabitur sodales nisi eget odio dignissim faucibus. Morbi imperdiet, nibh id congue sagittis, metus orci rhoncus eros, vel facilisis est nisl at augue. Praesent ultrices condimentum libero id cursus. Nullam in porta sapien, nec congue odio. Nam sit amet consectetur dolor, in aliquet lacus. Pellentesque ac tincidunt augue. Sed ut sodales velit.Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer semper sed est ut sollicitudin. Curabitur sodales nisi eget odio dignissim faucibus. Morbi imperdiet, nibh id congue sagittis, metus orci rhoncus eros, vel facilisis est nisl at augue. Praesent ultrices condimentum libero id cursus. Nullam in porta sapien, nec congue odio. Nam sit amet consectetur dolor, in aliquet lacus. Pellentesque ac tincidunt augue. Sed ut sodales velit.Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer semper sed est ut sollicitudin. Curabitur sodales nisi eget odio dignissim faucibus. Morbi imperdiet, nibh id congue sagittis, metus orci rhoncus eros, vel facilisis est nisl at augue. Praesent ultrices condimentum libero id cursus. Nullam in porta sapien, nec congue odio. Nam sit amet consectetur dolor, in aliquet lacus. Pellentesque ac tincidunt augue. Sed ut sodales velit.Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer semper sed est ut sollicitudin. Curabitur sodales nisi eget odio dignissim faucibus. Morbi imperdiet, nibh id congue sagittis, metus orci rhoncus eros, vel facilisis est nisl at augue. Praesent ultrices condimentum libero id cursus. Nullam in porta sapien, nec congue odio. Nam sit amet consectetur dolor, in aliquet lacus. Pellentesque ac tincidunt augue. Sed ut sodales velit.Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer semper sed est ut sollicitudin. Curabitur sodales nisi eget odio dignissim faucibus. Morbi imperdiet, nibh id congue sagittis, metus orci rhoncus eros, vel facilisis est nisl at augue. Praesent ultrices condimentum libero id cursus. Nullam in porta sapien, nec congue odio. Nam sit amet consectetur dolor, in aliquet lacus. Pellentesque ac tincidunt augue. Sed ut sodales velit.Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer semper sed est ut sollicitudin. Curabitur sodales nisi eget odio dignissim faucibus. Morbi imperdiet, nibh id congue sagittis, metus orci rhoncus eros, vel facilisis est nisl at augue. Praesent ultrices condimentum libero id cursus. Nullam in porta sapien, nec congue odio. Nam sit amet consectetur dolor, in aliquet lacus. Pellentesque ac tincidunt augue. Sed ut sodales velit.Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer semper sed est ut sollicitudin. Curabitur sodales nisi eget odio dignissim faucibus. Morbi imperdiet, nibh id congue sagittis, metus orci rhoncus eros, vel facilisis est nisl at augue. Praesent ultrices condimentum libero id cursus. Nullam in porta sapien, nec congue odio. Nam sit amet consectetur dolor, in aliquet lacus. Pellentesque ac tincidunt augue. Sed ut sodales velit.'
Tests:
Index
let a for(let i = 0; i < DATA.length; i++){ a = DATA.slice(i, i+1) }
Slice
let b let copy = DATA while(copy.length){ a = copy.slice(0, 1) copy = copy.slice(1) }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
Index
Slice
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'm ready to help. **Benchmark Definition Explanation** The provided JSON represents a benchmarking test that compares two approaches for iterating over the data string: 1. **Index**: This approach uses the `for` loop with an index variable `i` to iterate over the characters of the string. It assigns the substring from the current index to the next index (`a = DATA.slice(i, i+1)`). 2. **Slice**: This approach uses a `while` loop and repeatedly calls the `slice()` method on the data string. It creates a new substring by extracting the first character from the original string and discards it (`copy = copy.slice(1)`). **Comparison of Approaches** The two approaches have different performance characteristics: * **Index**: This approach is likely to be slower because it requires creating a new substring object on each iteration, which can lead to increased memory allocation and garbage collection. * **Slice**: This approach uses the `slice()` method in a more efficient way. The `slice()` method returns a new string object that refers to a subset of the original string. By repeatedly calling `slice()` and assigning the result back to `a`, this approach minimizes the number of allocations and copies required. **Pros and Cons** * **Index**: Pros: + Simple and easy to understand. Cons: Potential performance overhead due to repeated substring creations. * **Slice**: Pros: + More efficient in terms of memory usage and garbage collection. Cons: May be less intuitive for some developers due to its counterintuitive behavior. **Library Usage** The `slice()` method is a built-in JavaScript method that creates a new string object from a portion of an existing string. It's not specific to any library, but rather a standard part of the ECMAScript specification. **Special JS Features or Syntax** There are no special features or syntax used in this benchmarking test. The code is straightforward and follows standard JavaScript conventions. **Other Alternatives** If you wanted to compare these approaches using a different method, some alternatives could be: * Using `Array.prototype.forEach()` instead of `for` loops * Using a custom loop implementation that uses bitwise operations or other optimized techniques * Using a Just-In-Time (JIT) compiler or a native code generator to optimize the benchmark However, the `slice()` method is a well-established and efficient way to iterate over strings in JavaScript, making it an excellent choice for this benchmark.
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