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Array.prototype.concat vs Spread operator
(version: 0)
Compare the new ES6 spread operator with the traditional concat() method on large datasets
Comparing performance of:
Array.prototype.concat vs Spread operator
Created:
8 years ago
by:
Guest
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Tests:
Array.prototype.concat
const test = [].concat(Array(10000).fill('1')).concat(Array(100).fill('2'));
Spread operator
const test = [ ...Array(10000).fill('1'), ...Array(100).fill('2')];
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Suite status:
<idle, ready to run>
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Test case name
Result
Array.prototype.concat
Spread operator
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Slowest:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down what's being tested in the provided JSON data. **Benchmark Definition** The benchmark compares two approaches to concatenate arrays: the traditional `Array.prototype.concat()` method and the new ES6 spread operator (`...`). **Options Compared** Two options are compared: 1. **Traditional `Array.prototype.concat()`**: This method creates a new array by copying elements from two existing arrays. 2. **Spread Operator (`...`)**: This operator creates a new array by spreading the elements of an existing array. **Pros and Cons** Here's a brief summary of the pros and cons of each approach: **Traditional `Array.prototype.concat()`** Pros: * Wide browser support (not just modern JavaScript engines) * Can be used with older browsers that don't support the spread operator * May be more familiar to developers who are used to this syntax Cons: * Creates a new array, which can lead to increased memory usage for large datasets * Less efficient than the spread operator due to the need to iterate over each element in the original arrays **Spread Operator (`...`)** Pros: * More concise and expressive syntax * Efficient creation of a new array without the need for explicit iteration * Supports modern JavaScript engines, including WebAssembly-based browsers Cons: * Requires support for the spread operator, which may not be available in older browsers or environments * Can lead to unexpected behavior if not used carefully (e.g., with arrays containing non-iterable values) **Other Considerations** The benchmark assumes that the test case uses a large dataset (10000 elements) and is executed on a desktop platform. The spread operator may have performance advantages in this scenario due to its efficiency, but the actual results depend on various factors, such as browser implementation and system resources. **Library Usage** There is no explicit library usage mentioned in the provided data. However, it's worth noting that the benchmark might use libraries like `lodash` or other utility functions for array operations, which are not explicitly mentioned. **Special JavaScript Features/Syntax** The spread operator (`...`) is a modern JavaScript feature introduced in ECMAScript 2015 (ES6). It provides a concise way to create new arrays by spreading elements from an existing array. This syntax has become widely adopted in modern JavaScript development. Overall, the benchmark aims to measure the performance difference between two approaches to concatenate arrays, with a focus on the spread operator's efficiency and traditional `Array.prototype.concat()` method's legacy support.
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