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splice empty vs check first
(version: 0)
Comparing performance of:
Splice vs Test first
Created:
4 years ago
by:
Guest
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Tests:
Splice
const testArray = [1, 2, 3]; const emptyArray = []; const newTestArray = testArray.splice(testArray.length, 0, ...emptyArray);
Test first
const testArray = [1, 2, 3]; const emptyArray = []; if(emptyArray.length) { const newTestArray = testArray.splice(testArray.length, 0, ...emptyArray); }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
Splice
Test first
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided JSON data and explain what's being tested, compared, and other considerations. **Benchmark Definition** The benchmark is defined as a simple JavaScript script that creates two arrays: `testArray` with elements `[1, 2, 3]`, and `emptyArray` which is an empty array. The test case then uses one of two approaches to create a new array `newTestArray` by either splicing `testArray` or checking if `emptyArray` has any length before splicing. **Script Preparation Code** There are no script preparation code instructions provided, so we'll focus on the script itself. **Html Preparation Code** There are also no Html preparation code instructions provided. **Individual Test Cases** We have two test cases: 1. **Splice**: This test case uses the `splice()` method to create a new array by inserting the elements of `emptyArray` at the beginning of `testArray`. The script directly calls `splice()`. 2. **Test first**: This test case checks if `emptyArray` has any length before using `splice()`. If it does, it creates a new array by splicing `testArray`. **Library and Purpose** There is no library mentioned in the provided code. **Special JS Features or Syntax** Neither of the test cases uses any special JavaScript features or syntax. **Pros and Cons of Different Approaches** The two approaches have different performance implications: * **Splice**: This approach directly calls `splice()`, which can be more expensive due to the overhead of modifying an array. However, since we're only inserting elements at the beginning, it's likely that the cost is mostly due to the bounds check. * **Test first**: This approach checks if `emptyArray` has any length before splicing. Since arrays in JavaScript are zero-based ( indices start at 0), checking for an empty array is essentially a check for a non-positive index. In modern browsers, this check is likely to be very fast. **Other Considerations** The choice of approach depends on the specific requirements and constraints of your use case: * If you prioritize simplicity over performance, `Test first` might be a better choice. * If you're working with large arrays or need to perform many insertions, `Splice` might be slower due to its overhead. **Other Alternatives** If you're interested in exploring alternative approaches, here are a few possibilities: * Using the spread operator (`...`) instead of `splice()`, which can create a new array without modifying the original. * Using an iterative approach to insert elements into the array, rather than relying on the `splice()` method. Keep in mind that these alternatives might have different performance characteristics and trade-offs depending on your specific use case.
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