Toggle navigation
MeasureThat.net
Create a benchmark
Tools
Feedback
FAQ
Register
Log In
Array from() vs Map.keys() vs Map.values() vs spread (fixed)
(version: 0)
Comparing performance of:
Array.from vs Map.keys vs Map.values vs Spread ...
Created:
4 years ago
by:
Guest
Jump to the latest result
Tests:
Array.from
var fooMap = new Map(); for(var i=0;i<10000;i++) { fooMap.set(i, i); } var other = [...fooMap];
Map.keys
var fooMap = new Map(); for(var i=0;i<10000;i++) { fooMap.set(i, i); } var other = [...fooMap.keys()];
Map.values
var fooMap = new Map(); for(var i=0;i<10000;i++) { fooMap.set(i, i); } var other = [...fooMap.values()];
Spread ...
var fooMap = new Map(); for(var i=0;i<10000;i++) { fooMap.set(i, i); } var other = [...fooMap];
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (4)
Previous results
Fork
Test case name
Result
Array.from
Map.keys
Map.values
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 world of JavaScript microbenchmarks! **Benchmark Overview** The benchmark measures the performance of different methods to create an array from a Map object: 1. `Array.from()` 2. `Map.keys()` 3. `Map.values()` 4. Spread syntax (`...`) **Method Comparison** Here's a brief explanation of each method and their pros and cons: ### 1. `Array.from()` with spread operator (`...`) * **Pros:** Simple, readable, and widely supported. * **Cons:** May incur additional overhead due to the creation of an intermediate array. ### 2. `Map.keys()` * **Pros:** Returns a new iterator over the keys of the Map object, which can be more efficient than creating an array with `Array.from()` or spread operator. * **Cons:** May require additional memory allocation for the iterator object and may incur overhead due to the creation of the iterator. ### 3. `Map.values()` * **Pros:** Similar to `Map.keys()`, but returns a new iterator over the values of the Map object, which can be more efficient than creating an array with `Array.from()` or spread operator. * **Cons:** May require additional memory allocation for the iterator object and may incur overhead due to the creation of the iterator. ### 4. Spread syntax (`...`) * **Pros:** Simple, readable, and widely supported. * **Cons:** May incur additional overhead due to the creation of an intermediate array. **Library** The benchmark uses the built-in `Map` object in JavaScript, which is a dictionary-like data structure that stores key-value pairs. The purpose of the Map object is to provide a way to store and look up values using keys. **Special JS Feature/Syntax** There is no special JavaScript feature or syntax used in this benchmark. It only relies on standard JavaScript features like arrays, maps, and spread operators. **Alternatives** Other alternatives for creating an array from a map could include: * `map()`: A method that creates a new array by iterating over the key-value pairs of a Map object. * `forEach()` with callback function: Similar to `map()`, but without returning a new array. * Creating an array manually using a loop. However, these alternatives may not be as efficient or concise as the methods used in this benchmark. In conclusion, the benchmark provides a clear comparison of different methods for creating an array from a Map object. By understanding the pros and cons of each method, developers can choose the most efficient approach for their specific use case.
Related benchmarks:
Javascript string to array mapping: Array.from() vs Spread syntax [...spread]
Array from() vs Map.keys() vs Map.values() vs spread
Array.from() vs new Array() - map
Array.from() vs new Array().map()
Array Spread vs Fill vs New Array
Comments
Confirm delete:
Do you really want to delete benchmark?