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javascript spread bis
(version: 0)
Comparing performance of:
spread vs push
Created:
2 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
data = []; for(let i=0; i<1000; i++) { data.push([...Array(100).keys()]) }
Tests:
spread
data.reduce((acc, item) => { return [...acc, ...item]; }, [])
push
data.reduce((acc, item) => { acc.push(...item); return acc; }, [])
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
spread
push
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the world of JavaScript microbenchmarks. **Benchmark Overview** MeasureThat.net is a platform for creating and running JavaScript microbenchmarks, which allow users to compare the performance of different approaches to solving specific problems. The benchmark you provided measures two different ways of using the spread operator (`...`) in the `reduce()` method. **Spread Operator** The spread operator (`...`) is a syntax feature introduced in ECMAScript 2015 (ES6). It allows you to expand an array or object into individual elements, making it easier to manipulate and work with data structures. In this benchmark, we're comparing two approaches: 1. **Pushing individual elements**: Using the spread operator to push each element of an array onto a new accumulator array. 2. **Pushing entire arrays at once**: Using the spread operator to concatenate multiple arrays into a single array. **Benchmark Results** The latest benchmark results show that: * The "push" approach (using `...` with `push()`) outperforms the "spread" approach (using `...` with `concat()` or direct concatenation) by a significant margin, with an execution rate of 1299.3931884765625 executions per second compared to 3.90407133102417. **Pros and Cons** Here are some pros and cons of each approach: **Pushing individual elements** Pros: * More concise and readable code * Can be faster since it avoids creating intermediate arrays Cons: * May incur overhead due to array resizing or pushing individual elements onto the accumulator array **Pushing entire arrays at once** Pros: * Can be more efficient since it avoids unnecessary array resizing or concatenation Cons: * Less concise and less readable code * Can lead to stack overflows if dealing with very large arrays **Other Considerations** When using the spread operator, keep in mind that: * It creates a new array each time you use `...`, which can be memory-intensive. * It may not be suitable for use cases where performance is critical due to its potential overhead. **Alternative Approaches** If you're interested in exploring alternative approaches, here are a few options: 1. **Using `Array.prototype.forEach()`**: Instead of using the spread operator, you could use `forEach()` to iterate over each element and push it onto the accumulator array. 2. **Using `reduce()` with a different callback function**: You could define your own custom callback function that uses a different approach to concatenate arrays or elements. Keep in mind that these alternatives may have different performance characteristics and trade-offs, so be sure to test and benchmark them thoroughly before choosing an approach for your specific use case. I hope this explanation helps!
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