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sliceeee
(version: 0)
Comparing performance of:
slice vs spread
Created:
5 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
var arr = [0,1,2,3,4,5,6,7,8,9];
Tests:
slice
let newArr = arr.slice();
spread
let newArr = [...arr];
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
slice
spread
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'd be happy to explain what's being tested in the provided benchmark. **Benchmark Definition** The benchmark is defined by a JSON object that contains the following information: * `Name`: A unique name for the benchmark, which is "sliceeee". * `Description`: An empty string, indicating that there is no description for this benchmark. * `Script Preparation Code`: A JavaScript snippet that creates an array variable `arr` and assigns it a value of `[0,1,2,3,4,5,6,7,8,9]`. This code is executed before running the benchmark tests. * `Html Preparation Code`: An empty string, indicating that no HTML preparation code is needed. **Individual Test Cases** The benchmark consists of two test cases: 1. **"slice"`**: The benchmark definition is a simple JavaScript statement: `let newArr = arr.slice();`. This test case measures the performance of the `slice()` method on an array. 2. **"spread"`**: The benchmark definition is another JavaScript statement: `let newArr = [...arr];`. This test case measures the performance of the spread operator (`...`) on an array. **Libraries and Special JS Features** Neither of these test cases uses any external libraries or special JavaScript features beyond what's built into modern browsers. However, it's worth noting that some modern browsers may optimize certain methods like `slice()` or use techniques like inlining functions to improve performance, which could affect the results. **Approaches Compared** The two test cases compare the performance of two different approaches for creating a new array: 1. **`slice()`**: The `slice()` method returns a shallow copy of a portion of an array. 2. **Spread Operator (`...`)**: The spread operator creates a new array by copying elements from an existing array. **Pros and Cons** Here are some pros and cons of each approach: * **`slice()`**: + Pros: Efficient for large arrays, as it only copies the specified portion. + Cons: May have additional overhead due to method call and bounds checking. * **Spread Operator (`...`)**: + Pros: More readable and concise, with less overhead than `slice()`. + Cons: Can be slower for very large arrays due to copying all elements. **Other Considerations** When choosing between these approaches, consider the size of your array, the performance requirements of your application, and personal coding style. For small to medium-sized arrays, the spread operator might be a better choice due to its readability and conciseness. However, for large arrays or high-performance applications, `slice()` might be more efficient. **Alternatives** If you're interested in exploring alternative approaches, consider the following: * **`concat()`**: This method creates a new array by concatenating two or more arrays. While it's similar to the spread operator, it can be slower and less efficient due to its additional overhead. * **`Array.prototype.reduce()`**: This method applies a reducer function to an array, accumulating values as it goes. While it can be used for creating a new array, it's not typically faster or more efficient than `slice()` or the spread operator. Keep in mind that these alternatives may have their own trade-offs and performance characteristics, so it's essential to consider your specific use case and requirements when choosing an approach.
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First item
slice vs new array
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