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Javascript array cloning slice vs spread
(version: 1)
Compare the new ES6 spread operator with the traditional slice() method
Comparing performance of:
Slice vs Spread
Created:
4 years ago
by:
Registered User
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Tests:
Slice
var original = [ "hello", true, 7 ]; var copy = params.slice(0);
Spread
var original = [ "hello", true, 7 ] var copy = [ ...params ]
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
Slice
Spread
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'll explain the benchmark in detail. **What is being tested?** The provided JSON represents a JavaScript microbenchmark on measuring the performance of two approaches for creating a copy of an array: using the `slice()` method and the new ES6 spread operator (`[ ... ]`). **Options compared** Two options are being compared: 1. **Slice Method**: The traditional way to create a copy of an array in JavaScript, which involves calling the `slice()` method on the original array. 2. **Spread Operator (ES6)**: A new feature introduced in ECMAScript 2015 that allows creating a copy of an array using the syntax `[ ... ]`. **Pros and Cons** Here's a brief overview of each approach: * **Slice Method**: + Pros: Widely supported by older browsers, easy to implement, and has been around for a long time. + Cons: Can be slower than the spread operator in modern JavaScript engines due to the overhead of calling `slice()`. * **Spread Operator (ES6)**: + Pros: Modern and efficient way to create an array copy, especially in newer browsers that support it. It's also more readable and concise. + Cons: May not work in older browsers or environments that don't support ES6 features. **Library** None are explicitly mentioned in the provided JSON. **Special JS feature or syntax** The spread operator (`[ ... ]`) is a new feature introduced in ECMAScript 2015, also known as "Destructuring assignment". It allows creating a new array by spreading elements from an existing array or other iterable. **Other alternatives** Before the spread operator was introduced, developers used various workarounds to create array copies, such as using `Array.prototype.slice.call()` or `Array.prototype.slice.apply()`. However, these methods can be slower and less readable than the spread operator. In summary, this benchmark compares two approaches for creating an array copy: the traditional `slice()` method and the modern spread operator. The test aims to measure which approach is more efficient in modern JavaScript engines.
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