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filter vs spread slice
(version: 0)
Comparing performance of:
spread slice vs filter
Created:
6 years ago
by:
Registered User
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Script Preparation code:
var length = 1000000; var users = new Array(length); users.fill({"yes": "yes"}); var indexToRemove = Math.floor(Math.random()*(length - 1));
Tests:
spread slice
const result = [...users.slice(0, indexToRemove), ...users.slice(indexToRemove + 1)];
filter
const result = users.filter((item, index) => index !== indexToRemove);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
spread slice
filter
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'll break down the benchmark for you. **Benchmark Definition** The benchmark measures the performance of two different approaches to remove an element from an array: using the spread operator (`...`) and slicing with `Array.prototype.slice()`. The input data consists of an array of 1,000,000 objects, each containing a single property `"yes"`. A random index is generated to simulate removing an element. **Options Compared** The benchmark compares two options: 1. **Spread Operator**: Using the spread operator (`...`) to create a new array that includes all elements before and after the target index. 2. **Slicing with `Array.prototype.slice()`**: Using `Array.prototype.slice()` to create a new array that includes all elements before the target index. **Pros and Cons** * **Spread Operator**: Pros: + Concise and readable code + Can be faster for small arrays due to cache locality * Cons: + Creates a new array, which can lead to increased memory allocation and garbage collection overhead + May not perform well for very large arrays due to stack size limits * **Slicing with `Array.prototype.slice()`**: Pros: + More efficient than the spread operator for large arrays (due to its use of cache locality) + Less memory allocation overhead, as it only creates a new array reference * Cons: + May be less readable code compared to the spread operator + Requires understanding of `Array.prototype.slice()` behavior **Library and Special JS Features** In this benchmark, no libraries or special JavaScript features are used. The test cases use standard JavaScript APIs. **Other Alternatives** If you wanted to remove an element from an array without using either the spread operator or slicing with `Array.prototype.slice()`, other alternatives could include: 1. **Using `splice()`**: `array.splice(index, 1);` would remove the element at the specified index. 2. **Using a `forEach` loop and `push()`**: Create a new array by iterating through the original array using `forEach`, pushing each element onto a new array, and then removing the target element. Keep in mind that these alternatives may have different performance characteristics compared to the spread operator and slicing with `Array.prototype.slice()`.
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