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Array.from vs Spread with Map
(version: 0)
Comparing performance of:
Array.from vs Spread
Created:
3 years ago
by:
Guest
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Tests:
Array.from
var fooMap = new Map(); for(var i=0;i<100;i++) { fooMap.set(i, {n: i}); } var other = Array.from(fooMap.values());
Spread
var fooMap = new Map(); for(var i=0;i<100;i++) { fooMap.set(i, {n: i}); } var other = [...fooMap.values()];
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Suite status:
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Test case name
Result
Array.from
Spread
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
The provided benchmark measures the performance difference between two approaches: using the `Map` data structure in JavaScript and converting it to an array using either the spread operator (`[...]`) or the `Array.from()` method. **Options compared:** 1. **Spread Operator (`[...]`)**: This approach converts a map (or any other iterable) to an array by creating a new array with all the values from the map. 2. **`Array.from()` Method**: This approach also converts a map to an array, but uses the `Array.from()` method to create a new array with all the values from the map. **Pros and Cons of each approach:** * **Spread Operator (`[...]`)**: + Pros: Simple, concise syntax. Can be used with other iterables like sets or even custom iterable objects. + Cons: Creates a new array with all the values from the map, which can lead to memory overhead. * **`Array.from()` Method**: + Pros: More explicit and readable syntax. Allows for customization of the resulting array (e.g., `Array.from(map, obj => obj.n)`). + Cons: Can be slower than the spread operator due to the creation of a new function. **Other considerations:** * Both approaches have a time complexity of O(n), where n is the number of elements in the map. However, the spread operator might be slightly faster due to its simplicity. * The `Array.from()` method can also be used with other iterables, making it more versatile than the spread operator. **Library and syntax:** In this benchmark, no libraries are explicitly mentioned, but the use of the `Map` data structure suggests that the JavaScript standard library is being tested. No special JavaScript features or syntax are mentioned. **Other alternatives:** For creating arrays from maps, other approaches could include: * Using `reduce()` method to create an array. * Using a loop to push elements into an array. * Using a library like Lodash's `mapValues()` function. However, the spread operator and `Array.from()` method are likely the most common and efficient ways to perform this operation in JavaScript.
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