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slice VS splice (clone) VS shift: who is the fastest to keep constant size
(version: 0)
100k list splice and shift win, they mutate list slice loose, it creates a copy of list 7.5x slower
Comparing performance of:
slice vs splice vs shift
Created:
6 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
var list = []; for (var i = 0; i < 1000 * 1000; i++) { list.push(i); }
Tests:
slice
list.push('slice'); list = list.slice(1);
splice
list.push('splice'); var clone = [...list]; clone.splice(0, 1);
shift
list.push('splice'); list.shift();
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
slice
splice
shift
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the world of JavaScript microbenchmarks! **Benchmark Definition and Purpose** The benchmark aims to compare the performance of three different approaches to manipulate an array of length 100,000: 1. `slice`: Creates a new array by copying a subset of elements from the original array. 2. `splice`: Mutates the original array by removing or inserting elements at specific positions. 3. `shift`: Removes and returns the first element of the array. The benchmark measures which approach is the fastest to maintain a constant size of the array, while still performing the specified operation. **Options Compared** * `slice` vs `splice` vs `shift` * Both `splice` and `shift` mutate the original array, whereas `slice` creates a new copy. * `splice` can be slower due to its potential impact on the array's internal structure. * `shift` can be faster since it only removes the first element, which is typically less expensive than modifying an array's middle or end elements. **Pros and Cons** * **slice**: Creates a new copy of the array, ensuring data integrity and avoiding side effects. However, this approach can be slower due to the overhead of creating a new object. * **splice**: Mutates the original array, which may lead to unintended consequences if not used carefully. On the other hand, `splice` is typically faster than `slice`, especially for larger arrays, since it only requires modifying the existing data structure. * **shift**: Removes and returns the first element of the array, making it a fast and efficient choice for certain use cases. However, it may not be suitable when the array is large or empty. **Library: `Array.prototype.slice()`** The `slice()` method creates a new array by copying a subset of elements from the original array. It takes two arguments: * The start index (inclusive) * The end index (exclusive) In this benchmark, `slice` is used to create a copy of the first 99,999 elements of the array (`list.slice(1)`). **Library: `Array.prototype.splice()`** The `splice()` method modifies the original array by removing or inserting elements at specific positions. It takes two arguments: * The index of the element to be removed (or inserted) * The number of elements to remove (or insert) In this benchmark, `splice` is used to remove the first element from the array (`clone.splice(0, 1)`). **Library: `Array.prototype.shift()`** The `shift()` method removes and returns the first element of the array. It does not modify the original array. In this benchmark, `shift` is used to remove and return the first element of the array (`list.shift()`). **Special JS Feature/ Syntax** None mentioned in this benchmark. **Alternatives** Other approaches to manipulate arrays could be considered, such as: * Using `Array.prototype.map()`, `Array.prototype.filter()`, or `Array.prototypeforEach()` instead of `slice` or `splice`. * Using `Array.prototype.concat()` or `Array.prototype.push()` to add elements to the array. * Implementing custom iteration logic using loops and indexing. However, these alternatives may not be as efficient or effective as the original approaches used in this benchmark.
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