Toggle navigation
MeasureThat.net
Create a benchmark
Tools
Feedback
FAQ
Register
Log In
Array.from vs Spread 5
(version: 0)
Comparing performance of:
Array.from vs Spread
Created:
6 years ago
by:
Guest
Jump to the latest result
Tests:
Array.from
var ab = Array.from(Array(1000).keys());
Spread
var ab = [...Array(1000).keys()];
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
Fork
Test case name
Result
Array.from
Spread
Fastest:
N/A
Slowest:
N/A
Latest run results:
No previous run results
This benchmark does not have any results yet. Be the first one
to run it!
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided JSON and explain what's being tested. The benchmark is comparing two approaches to create an array from an existing array: 1. `Array.from()` 2. The spread operator (`...`) **What are we testing?** We're testing how fast each approach creates an array with 1000 elements, using the `.keys()` method to generate a sequence of numbers. **Options being compared:** * `Array.from()`: This is a built-in JavaScript function that converts an iterable object (like an array or a string) into a new array. In this case, it's used to create an array from the result of `.keys()`. * The spread operator (`...`): This is a shorthand for creating a new array by spreading the elements of an existing array. **Pros and Cons:** * `Array.from()`: + Pros: More explicit and readable code. It clearly conveys the intention of creating a new array from an iterable object. + Cons: May have slightly slower performance due to the overhead of calling a function. * The spread operator (`...`): + Pros: Concise and expressive syntax, making the code more compact and easier to read. + Cons: May be less explicit about its intentions, and some developers might find it less readable. **Library usage:** None **Special JavaScript feature or syntax:** The spread operator is a built-in JavaScript feature since ECMAScript 2015 (ES6). It's used to create a new array by spreading the elements of an existing array. **Other alternatives:** If you want to avoid using `Array.from()` and the spread operator, you can use other approaches like: * Looping manually: Use a `for` loop or `while` loop to create an array from scratch. * Using `Array.prototype.slice()`: Create a new array by slicing the original array into smaller chunks. However, these alternatives are less efficient and more verbose than using `Array.from()` and the spread operator. In summary, this benchmark is testing the performance difference between two approaches: `Array.from()` and the spread operator. The results will help users understand which approach to use depending on their specific needs and performance requirements.
Related benchmarks:
Javascript string to array mapping: Array.from() vs Spread syntax [...spread]
Javascript: Spread vs push
Array.from() vs spread []
new Array using spreading operator vs Array.slice()
spread vs ArrayFrom
Comments
Confirm delete:
Do you really want to delete benchmark?