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JS array union - concat vs spread
(version: 0)
Comparing performance of:
Array concat vs Array spread
Created:
6 years ago
by:
Guest
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Tests:
Array concat
const a = ['a','b','c'] const b = [1,2,3,4] const c = a.concat(b)
Array spread
const a = ['a','b','c'] const b = [1,2,3,4] const c = [...a, ...b]
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
Array concat
Array spread
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
**Benchmark Explanation** MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks. The provided JSON represents two individual test cases: "Array concat" and "Array spread". These test cases aim to measure the performance difference between using the `concat` method versus the spread operator (`...`) when creating a new array by combining two existing arrays. **Options Compared** The two test cases compare the following options: 1. **Array Concatenation (`concat` method)**: This method creates a new array by concatenating two or more arrays. 2. **Spread Operator (`...`)**: This operator creates a new array by spreading the elements of an existing array. **Pros and Cons** * **Array Concatenation (`concat` method)`: + Pros: - Easy to understand and use for simple cases. - Often used in older JavaScript versions (before ES6). + Cons: - Less efficient than the spread operator, especially for large arrays. - Creates a new array object, which can lead to unnecessary memory allocation. * **Spread Operator (`...`)**: + Pros: - More efficient than concatenation, as it avoids creating a new array object. - Allows for more concise code and is often preferred in modern JavaScript versions (ES6+). + Cons: - Can be less intuitive for developers unfamiliar with the spread operator. **Library Use** None of the test cases use any external libraries. They rely solely on built-in JavaScript features. **Special JS Feature or Syntax** The test cases utilize the following special feature: * **Spread Operator (`...`)**: Introduced in ECMAScript 2015 (ES6), this operator allows for more concise array creation and is widely supported by modern browsers and Node.js versions. **Benchmark Preparation Code** Since there is no preparation code provided, it's likely that MeasureThat.net automatically generates the necessary variables and setup for each test case. This ensures a fair comparison between the two options. **Other Alternatives** If you're interested in exploring alternative approaches, consider the following: * **Array.from()**: Introduced in ECMAScript 2015 (ES6), this method creates a new array from an iterable or an array-like object. * **Array.prototype.push()**: This method adds one or more elements to the end of an array. While not as efficient as the spread operator, it can still be used for simple cases. Keep in mind that these alternatives might not offer significant performance improvements over the spread operator for most use cases. However, they provide additional options for creating arrays and might be useful in specific scenarios or older JavaScript versions.
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