Toggle navigation
MeasureThat.net
Create a benchmark
Tools
Feedback
FAQ
Register
Log In
spread vs array.from on Map sorted
(version: 0)
Comparing performance of:
Array.from vs Spread
Created:
5 years ago
by:
Registered User
Jump to the latest result
Tests:
Array.from
var map = new Map(); for(var i=0;i<100;i++) { map.set(100-i, i); } var sortedMap = new Map(Array.from(map.entries()).sort((a, b) => a[0] - b[0]));
Spread
var map = new Map(); for(var i=0;i<100;i++) { map.set(100-i, i); } var sortedMap = new Map([...map.entries()].sort((a, b) => a[0] - b[0]));
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 dive into the explanation. The provided JSON represents a benchmark test on MeasureThat.net, which compares two approaches for creating a sorted Map from an array of key-value pairs: using `Array.from()` and using the spread operator (`...`). **Benchmark Definition** The benchmark definition is a simple script that creates a new Map, populates it with entries using a loop, and then sorts the Map based on its keys. There are two variations: 1. "Spread": This variation uses the spread operator (`...`) to convert the `Map.entries()` array into an array of key-value pairs. 2. "Array.from": This variation uses the `Array.from()` method to create a new array from the `Map.entries()` iterator. **Options Comparison** The two options are compared in terms of their performance, which is measured by the number of executions per second. * **Pros of Array.from()**: It is more concise and readable than using the spread operator. * **Cons of Array.from():** It might be slightly slower due to the overhead of creating a new array. * **Pros of Spread:** It is faster because it avoids the overhead of creating a new array, as the spread operator only creates a shallow copy of the array. * **Cons of Spread:** It requires JavaScript 3.0 or later and might not be compatible with older browsers. **Library Usage** Neither option uses a library. However, both use the built-in `Map` and `Array.from()` methods. **Special JS Feature/Syntax** This benchmark does not require any special JavaScript features or syntax that would be unfamiliar to most software engineers. **Other Alternatives** If you want to create a sorted Map from an array of key-value pairs without using `Array.from()` or the spread operator, you can use other approaches: * Use `reduce()`: Create a new array by reducing the `Map.entries()` iterator into an array. * Use `forEach()`: Iterate over the `Map.entries()` iterator and create a new array by pushing each entry into it. * Use a library like Lodash or Ramda, which provide functions for mapping and sorting arrays. In conclusion, this benchmark tests two approaches for creating a sorted Map from an array of key-value pairs: using `Array.from()` and using the spread operator. The choice between these options depends on performance considerations and compatibility with older browsers.
Related benchmarks:
Array.from vs Spread with undefined and map
Splice vs Spread to insert at beginning of array
Javascript string to array mapping: Array.from() vs Spread syntax [...spread]
slice sort vs spread sort vs sort
Sorting Arrays
Comments
Confirm delete:
Do you really want to delete benchmark?