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spread vs slice Dec2022
(version: 0)
Comparing performance of:
spread vs slice
Created:
3 years ago
by:
Registered User
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Script Preparation code:
var params = [ "hello", true, 7 ]
Tests:
spread
var other = [ ...params ]
slice
var other = params.slice()
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
spread
slice
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'll break down the provided JSON and explain what's being tested, compared, and their pros and cons. **Benchmark Definition** The benchmark definition is a simple JavaScript script that creates an array using either the spread operator (`...`) or the `slice()` method. The script preparation code defines an array `params` with three elements: `"hello"`, `true`, and `7`. **Options being compared** Two options are being compared: 1. **Spread Operator (`...`)**: This method creates a new array by copying all elements from the original array, including any nested arrays. 2. **Slice Method (`slice()`)**: This method returns a shallow copy of a portion of an array. **Pros and Cons of each approach** * **Spread Operator (`...`)**: + Pros: More concise and readable syntax, no need to specify the starting index. + Cons: Can be slower due to the creation of a new array object, which may not be immediately visible on the heap. * **Slice Method (`slice()`)**: + Pros: Faster execution time since it only creates a reference to the original array, rather than creating a new array. + Cons: Requires specifying the starting index, which can make the code less readable. **Library and purpose** There is no specific library mentioned in the provided JSON. However, it's worth noting that the `slice()` method has been implemented in JavaScript since its inception, making it a built-in part of the language. **Special JS feature or syntax** The use of the spread operator (`...`) is a relatively modern feature introduced in ECMAScript 2015 (ES6). It allows for more concise array creation and can be an advantage in terms of readability. However, its performance impact depends on the specific implementation and browser support. **Other alternatives** If you wanted to compare other array creation methods, you could consider using: * `Array.from()`: Creates a new array from an iterable or array-like object. * `Array.prototype.concat()`: Concatenates two or more arrays into a new array. * `Array.prototype.push()`: Appends one or more elements to the end of an array. These alternatives would introduce additional variables and potentially different performance characteristics, depending on the specific implementation and browser support.
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