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Array.prototype.slice vs spread operator part 2000: electric boogaloogaloogaloogaloo
(version: 0)
Comparing performance of:
Array.prototype.slice vs Spread operator
Created:
4 years ago
by:
Guest
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Tests:
Array.prototype.slice
let params = ['hello', true, 7] let copy = params.slice()
Spread operator
let params = ['hello', true, 7] let copy = [...params]
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Suite status:
<idle, ready to run>
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Test case name
Result
Array.prototype.slice
Spread operator
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 benchmark and explain what's being tested. **Benchmark Overview** The benchmark compares the performance of two approaches to create a copy of an array: using the `Array.prototype.slice()` method versus the spread operator (`...`). **Options Compared** There are two options compared: 1. **Array.prototype.slice()**: This method creates a shallow copy of an array by specifying a start and end index. 2. **Spread Operator (`...`)**: This operator creates a new array from an existing array or other iterable. **Pros and Cons of Each Approach** * **Array.prototype.slice()**: + Pros: - Can be faster for large arrays since it only creates a new array object, without copying the elements themselves. - More predictable performance since the number of elements copied is fixed. + Cons: - Can be slower for small arrays or when creating an exact copy of the original array. - May not work as expected if the original array has complex data structures (e.g., objects, arrays within arrays). * **Spread Operator (`...`)**: + Pros: - Creates a new array with exact copies of all elements, making it suitable for preserving object and array structure. - Can be faster than `Array.prototype.slice()` for small arrays or when creating an exact copy. + Cons: - May be slower for large arrays due to the overhead of creating multiple objects. - Less predictable performance since the number of elements copied depends on the length of the original array. **Library and Purpose** There is no library explicitly mentioned in the benchmark definition or test cases. However, both `Array.prototype.slice()` and the spread operator are part of the ECMAScript standard, making them built-in features of JavaScript. **Special JS Features/Syntax (None)** Neither the `Array.prototype.slice()` nor the spread operator use any special JavaScript features or syntax. **Other Alternatives** If you're looking for alternative approaches to create an array copy, consider: * Using a library like Lodash's `cloneDeep()` function, which can handle complex data structures and is often faster than the spread operator. * Utilizing a custom implementation of array copying using a loop, which can be optimized for performance but may require more manual memory management. Keep in mind that the choice of approach ultimately depends on your specific use case, performance requirements, and personal preference.
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