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Splice vs spread insert
(version: 0)
Splice vs spread
Comparing performance of:
Splice vs Spread
Created:
7 years ago
by:
Guest
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Script Preparation code:
xs = [...Array(1000).keys()]
Tests:
Splice
xs.splice(500, 0, 'hello')
Spread
[...xs.slice(0, 500), 'hello', ...xs.slice(500)]
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
Splice
Spread
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 benchmark and explain what's being tested. **Benchmark Definition** The benchmark is designed to compare the performance of two approaches: using `Array.prototype.splice()` vs using the spread operator (`...`) with array literals. The benchmark creates an array of 1000 keys (`xs = [...Array(1000).keys()]`), which serves as a baseline for the tests. **Test Cases** There are two test cases: 1. **Splice**: This test case uses `Array.prototype.splice()` to insert a string "hello" at index 500 in the original array. ```javascript xs.splice(500, 0, 'hello') ``` 2. **Spread**: This test case uses the spread operator (`...`) with array literals to create a new array by concatenating three parts: * The first part is the slice of the original array from index 0 to 499 (`xs.slice(0, 500)`). * The second part is the string "hello". * The third part is the slice of the original array from index 501 to the end (`xs.slice(500)`). ```javascript [...xs.slice(0, 500), 'hello', ...xs.slice(500)] ``` **Library and Special JS Features** Both test cases do not use any external libraries. They only rely on built-in JavaScript features. **Options Compared** The benchmark is comparing two approaches: 1. **Splice**: This approach uses the `splice()` method to modify the original array. 2. **Spread**: This approach uses the spread operator (`...`) with array literals to create a new array without modifying the original one. **Pros and Cons of Each Approach** **Splice:** Pros: * Can be more efficient for large arrays, as it modifies the original array in place. * Can be faster for certain use cases, such as inserting multiple elements at once. Cons: * Modifies the original array, which can have unintended side effects if not used carefully. * Can be slower than other approaches for small arrays or when dealing with immutable data structures. **Spread:** Pros: * Creates a new array without modifying the original one, making it safer and more predictable. * Is generally faster for small arrays or when dealing with immutable data structures. Cons: * Can be slower than `splice()` for large arrays or when inserting multiple elements at once. * Requires additional memory allocation to create the new array. **Other Considerations** When choosing between these approaches, consider the following factors: * **Memory efficiency**: If you're working with large datasets, using `splice()` might be more efficient in terms of memory usage. However, if you're working with small arrays or want to avoid modifying the original data, the spread operator is a better choice. * **Predictability and safety**: When working with large datasets or complex algorithms, the spread operator can provide additional safety guarantees by avoiding modifications to the original array. * **Readability and maintainability**: The spread operator can make code more readable by clearly expressing the intent of creating a new array without modifying the original one. **Alternatives** Other alternatives for inserting elements into an array include: 1. Using `Array.prototype.concat()` or `Array.prototype.push()`. 2. Creating a new array using `Array.from()` and then assigning it to a variable. 3. Using a library like Lodash, which provides a `_.slice()` function that can be used with the spread operator. These alternatives may have different performance characteristics, trade-offs in terms of memory usage or predictability, and differences in readability and maintainability compared to the original benchmark.
Related benchmarks:
Splice vs Spread to insert at beginning of array
Splice vs Spread vs Unshift to insert at beginning of array (fixed from slice)
Splice vs Spread vs Unshift vs Push to insert at beginning of array
Using Splice vs Spread vs Unshift to insert at beginning of array
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