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(version: 0)
Compare the new ES6 spread operator with push inside reduce
Comparing performance of:
spread operator vs Push
Created:
2 years ago
by:
Guest
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Tests:
spread operator
const arr = new Array(1000).fill(undefined).map((_, index) => index % 2); arr.reduce((acc, curr) => { if (curr) { acc.push('bla'); } return acc; }, []);
Push
const arr = new Array(1000).fill(undefined).map((_, index) => index % 2); arr.filter(val => val).map(() => 'bla');
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Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
spread operator
Push
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
**Benchmark Overview** The provided benchmark, hosted on MeasureThat.net, compares the performance of two approaches in JavaScript: using the spread operator (`...`) and pushing elements to an array using `arr.push()`. The test is designed to measure which approach is faster. **Test Cases** There are only two test cases: 1. **"spread operator"`**: This test case uses the new ES6 spread operator to create a large array, performs some processing on it, and then uses `reduce()` with an accumulator to push elements into another array. 2. **"Push"`**: This test case also creates a large array using the same method as the first test case, but instead of using `reduce()`, it filters out non-`undefined` values from the array using `Array.prototype.filter()`, and then maps over the resulting array to push elements into another array. **Options Compared** The two approaches being compared are: * **Spread Operator (`...`)**: This approach uses the spread operator to create a new array by spreading elements from an existing array. It is more concise and efficient than pushing elements onto an existing array. * **Pushing Elements onto an Array**: This approach involves creating a new array, filtering out non-`undefined` values using `Array.prototype.filter()`, and then mapping over the resulting array to push elements into another array. **Pros and Cons** **Spread Operator (`...`)** Pros: * More concise code * Can be more efficient in terms of memory usage and performance Cons: * May not work as expected if used incorrectly (e.g., spreading an object instead of an array) * May have compatibility issues with older browsers or environments that don't support the spread operator **Pushing Elements onto an Array** Pros: * More familiar to developers who are accustomed to working with arrays * Can be more straightforward to understand and debug Cons: * More verbose code * May involve unnecessary memory allocations and copy operations **Library Usage** There is no explicit library usage in the test cases provided. However, MeasureThat.net may use its own internal libraries or frameworks to implement the benchmarking framework. **Special JS Features/Syntax** The spread operator (`...`) was introduced as a new feature in ECMAScript 2015 (ES6). It allows you to create a new array by spreading elements from an existing array. **Alternative Approaches** Other approaches that could be used to compare performance include: * Using `Array.prototype.concat()` instead of the spread operator * Using `Array.prototype.slice()` instead of filtering out non-`undefined` values * Using a different data structure, such as a Set or a Map, instead of an array These alternative approaches may have their own pros and cons, and MeasureThat.net may choose to test them in future benchmarks.
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