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Array.prototype.slice method vs spread operator
(version: 1)
Compare the new ES6 spread operator with the traditional slice() method
Comparing performance of:
Array.prototype.slice vs spread operator
Created:
5 years ago
by:
Registered User
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Tests:
Array.prototype.slice
var params = [1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9,0]; var other = params.slice();
spread operator
var params = [1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9,0]; var other = [ ...params ]
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Suite status:
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Test case name
Result
Array.prototype.slice
spread operator
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided JSON and explain what's being tested. **Benchmark Definition** The benchmark is comparing two approaches to create a copy of an array: `Array.prototype.slice()` (traditional method) and the spread operator (`...params`). **Options Compared** The options being compared are: 1. **Traditional Method**: `Array.prototype.slice()` 2. **Spread Operator**: `[ ...params ]` **Pros and Cons of Each Approach** **Traditional Method (Slice)** Pros: * Wide support across browsers and platforms * Easy to read and understand for developers familiar with JavaScript Cons: * Can be slower than the spread operator due to its overhead * May not work as expected when used with certain types of arrays or elements **Spread Operator (Spreading Arrays)** Pros: * Faster execution speed compared to traditional slice * Works well with most types of arrays and elements, including objects and maps Cons: * Less intuitive for developers who are not familiar with the spread operator * Requires a modern JavaScript engine that supports the spread operator syntax (introduced in ES6) **Library Used** In this benchmark, no specific library is used. However, it's worth noting that both approaches can be affected by certain libraries or frameworks that manipulate arrays or objects. **Special JS Feature/Syntax** The spread operator (`...params`) is a feature introduced in modern JavaScript (ES6) that allows creating a new array from an existing array or other iterable. **Other Considerations** * **Cache performance**: Both approaches may have varying cache performance due to the nature of the data being processed. * **Browser-specific optimizations**: Different browsers may optimize or implement the spread operator differently, which can affect benchmark results. * **Array size and complexity**: The benchmark's focus on small arrays might not accurately represent real-world scenarios where larger arrays are more common. **Alternatives** Other alternatives for creating array copies could be: 1. `Array.prototype.concat()` 2. `Array.prototype.slice.call()` 3. `Array.from()` However, these approaches may have different trade-offs in terms of performance and compatibility with older browsers. Keep in mind that this benchmark is designed to compare the execution speed of two specific methods on a small array of elements. The results should be interpreted within the context of modern JavaScript engines and platforms.
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