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Array.from vs Spread. set & array
(version: 0)
Comparing performance of:
Array.from vs Spread vs Array.from array vs Spread array
Created:
4 years ago
by:
Guest
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Tests:
Array.from
var fooSet = new Set(); for(var i=0;i<10000;i++) { fooSet.add(i); } var other = Array.from(fooSet);
Spread
var fooSet = new Set(); for(var i=0;i<10000;i++) { fooSet.add(i); } var other = [...fooSet];
Array.from array
var foo = []; for(var i=0;i<10000;i++) { foo.push(i); } var other = Array.from(foo);
Spread array
var foo = []; for(var i=0;i<10000;i++) { foo.push(i); } var other = [...foo];
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Suite status:
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Test case name
Result
Array.from
Spread
Array.from array
Spread array
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 what's being tested in this benchmark: **Benchmark Definition**: The benchmark is comparing three different approaches to create an array from a set or an array of numbers using `Array.from()` and the spread operator (`...`). **Options being compared**: 1. **`Set` with `Array.from()`**: Creating a new set, adding 10,000 elements to it, and then converting the set to an array using `Array.from()`. 2. **Spread Operator (`...`) with `Set`**: Creating a new set, adding 10,000 elements to it, and then spreading its contents into a new array using the spread operator. 3. **`Array` with `Array.from()`**: Creating a new empty array, pushing 10,000 elements onto it, and then converting the array to an array using `Array.from()`. 4. **Spread Operator (`...`) with `Array`**: Creating a new empty array, pushing 10,000 elements onto it, and then spreading its contents into a new array using the spread operator. **Pros and Cons of each approach**: * **`Set` with `Array.from()`**: + Pros: Sets are optimized for fast insertion and lookup times, which can lead to better performance when converting to an array. + Cons: Creating a set and then converting it to an array may incur additional overhead due to the creation of a new data structure. * **Spread Operator (`...`) with `Set`**: + Pros: The spread operator is generally faster than using `Array.from()` because it doesn't require creating a new array object. + Cons: This approach relies on the implementation details of the set and the spread operator, which may vary across different browsers. * **`Array` with `Array.from()`**: + Pros: Arrays are optimized for fast iteration and indexing, which can lead to better performance when converting from an array to another array. + Cons: Pushing 10,000 elements onto an array can be slow due to the dynamic nature of arrays. * **Spread Operator (`...`) with `Array`**: + Pros: This approach is similar to using `Array.from()` but may be faster due to the spread operator's optimized implementation. + Cons: Similar to the set example, this approach relies on the implementation details of the array and the spread operator. **Library/ Syntax considerations**: * None mentioned in this benchmark. **Special JS feature/syntax**: The use of the spread operator (`...`) is a modern JavaScript feature that was introduced in ECMAScript 2015. It's supported by most modern browsers, including Firefox 102. **Other alternatives**: If you want to explore other approaches or variations on these benchmarks, here are some options: * Using `Array.prototype.slice()` instead of the spread operator. * Creating a custom array converter function to compare different implementations. * Adding more test cases with varying input sizes, data distributions, or other factors that might affect performance. Keep in mind that benchmarking JavaScript code can be complex and nuanced. The results may vary depending on the specific implementation details, hardware, and software configurations used during testing.
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