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Concat vs Push+Spread
(version: 0)
Comparing performance of:
Push Spread vs Concat
Created:
5 years ago
by:
Guest
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Tests:
Push Spread
const emitted = [[1,2,3,4,5,6,7,8,9,10],[1,2,3,4,5,6,7,8,9,10],[1,2,3,4,5,6,7,8,9,10],[1,2,3,4,5,6,7,8,9,10]] const ids = []; for (const e of emitted) ids.push(...e);
Concat
const emitted = [[1,2,3,4,5,6,7,8,9,10],[1,2,3,4,5,6,7,8,9,10],[1,2,3,4,5,6,7,8,9,10],[1,2,3,4,5,6,7,8,9,10]] let ids = []; for (const e of emitted) ids = ids.concat(e);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
Push Spread
Concat
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided JSON and benchmark setup to understand what is being tested. **Benchmark Definition** The benchmark definition is not explicitly provided in the JSON, but it can be inferred from the individual test cases. The two main approaches being compared are: 1. **Push Spread**: This approach uses the spread operator (`...`) to concatenate arrays. 2. **Concat**: This approach uses the `concat()` method to concatenate arrays. **Options Compared** The two options are being compared in terms of their performance, specifically how many executions per second (ExecutionsPerSecond) they can achieve on a desktop Windows platform using Chrome 83 browser. **Pros and Cons** * **Push Spread**: + Pros: More concise and readable code. It's also more "JavaScript-like" since it uses the spread operator, which is a common feature in modern JavaScript. + Cons: Performance might be slower due to the need for an extra operation (converting the array to an iterable) before applying the spread operator. * **Concat**: + Pros: Might be faster since it directly calls the `concat()` method on the existing array, avoiding an additional conversion step. + Cons: The code is less concise and more verbose compared to Push Spread. **Library/Functionality** There are no external libraries mentioned in the provided JSON. However, if we look at the benchmark definitions, we can see that the test cases use `for...of` loops with the `const e of emitted` syntax. This syntax is part of ECMAScript 2017 (ES6) and allows iterating over arrays without explicitly defining an index variable. **Special JS Feature/Syntax** The `for...of` loop with `const e of emitted` is a new feature introduced in ES6, which allows iterating over arrays or other iterable objects. This syntax provides a concise way to iterate over collections without the need for explicit indexing. **Other Alternatives** If you were to implement this benchmark yourself, alternative approaches could include: * Using `Array.prototype.reduce()` instead of concatenation * Using `Array.prototype.forEach()` instead of a loop * Using a library like Lodash's `concat` function or the `Array.prototype.concatAll()` method (if available) Keep in mind that the choice of approach depends on the specific requirements and constraints of your project. For this benchmark, Push Spread is likely being used to demonstrate its performance characteristics compared to Concat. I hope this explanation helps!
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