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remove array item performance
(version: 0)
Comparing performance of:
Splice vs CopyWithin vs Slice Concat
Created:
3 years ago
by:
Guest
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Tests:
Splice
const testArray = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20]; testArray.splice(9, 1);
CopyWithin
const testArray = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20]; testArray.copyWithin(9, 10); testArray.pop();
Slice Concat
const testArray = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20]; const newTestArray = testArray.slice(0, 9) newTestArray.push(...testArray.slice(10));
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
Splice
CopyWithin
Slice Concat
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
**Overview of the Benchmark** The provided benchmark measures the performance of three different approaches to remove an item from an array in JavaScript: 1. `splice()` 2. `copyWithin()` (with `pop()` at the end) 3. `slice()` + `concat()` These methods are used extensively in JavaScript programming and can significantly impact performance, especially for large datasets. **Options Compared** The benchmark compares the execution speed of each method: * `splice()`: Replaces an element at a specified position with another value. * `copyWithin()`: Copies elements from one part of an array to another part of the same array. * `slice()` + `concat()`: Creates a new array by copying parts of an existing array. **Pros and Cons of Each Approach** 1. **`splice()`**: * Pros: * Simple and widely supported * Works well for small to medium-sized arrays * Cons: * Can be slow for large arrays due to the need to shift elements after removal * Modifies the original array, which can lead to unexpected behavior if not handled carefully 2. **`copyWithin()`** (with `pop()` at the end): * Pros: * More efficient than `splice()` for large arrays since it avoids shifting elements * Leaves the original array unchanged * Cons: * Requires the use of `pop()` to remove the last element, which can be unnecessary and slower 3. **`slice()` + `concat()`**: * Pros: * Can create a new array without modifying the original one * Allows for more control over the elements included in the new array * Cons: * Creates a new array, which can be memory-intensive and slower than in-place methods **Library Usage** The benchmark uses no external libraries. However, it's worth noting that some JavaScript implementations might use internal helper functions or optimizations that could affect performance. **Special JS Features/Syntax** This benchmark does not utilize any special JavaScript features or syntax, such as `let`, `const`, arrow functions, or async/await. **Alternatives** If you're looking for alternatives to this benchmark, consider the following options: * Use a different array manipulation method, like using `filter()` or `map()`. * Implement your own custom array manipulation function and benchmark its performance. * Use a library or framework that provides optimized array manipulation functions (e.g., Lodash). Keep in mind that the choice of alternative will depend on the specific requirements and constraints of your project. **Benchmark Preparation Code** The provided benchmark preparation code is quite simple: ```javascript const testArray = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20]; ``` This code creates a large array with 20 elements, which is used as the test data for the benchmark.
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