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Array.from vs spread - MG
(version: 0)
Comparing performance of:
spread vs Array.from
Created:
5 years ago
by:
Guest
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Script Preparation code:
length = 5
Tests:
spread
[...Array(length)].map(() => 'bla ble blu').join(' ')
Array.from
Array.from({ length }, () => 'bla ble blu').join(' ')
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
spread
Array.from
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark definition and test cases. **Benchmark Definition** The benchmark is designed to compare two approaches for creating an array of strings and joining them together: 1. `Array.prototype.map()` with string concatenation (`"bla ble blu".repeat(length)`) 2. `Array.from()` with a callback function that returns the same string **Options Compared** * **Approach 1: Using `Array.prototype.map()`** + Pros: - Simple and straightforward - Easy to understand for beginners + Cons: - May lead to slower performance due to the overhead of the `map()` function - Creates a new array, which can be inefficient if the original array is very large * **Approach 2: Using `Array.from()`** + Pros: - More efficient than `map()` because it avoids creating an intermediate array - Can take advantage of modern browsers' native `Array.from()` optimization + Cons: - May be less intuitive for beginners who are not familiar with `Array.from()` - Requires the use of a callback function, which can add complexity **Library Used** In this benchmark, `Array.prototype.map()` is used, which is a built-in JavaScript method. There is no external library being used. **Special JS Feature or Syntax** There are no special JavaScript features or syntax being tested in this benchmark. The focus is on comparing the performance of two different array creation approaches. **Other Alternatives** If you want to explore alternative approaches for creating an array of strings and joining them together, here are a few options: 1. Using `Array.prototype.fill()` with a string: `new Array(length).fill('bla ble blu')` 2. Using `String.prototype.repeat()`: `'bla ble blu'.repeat(length)` 3. Using a simple loop: `var result = []; for (var i = 0; i < length; i++) { result.push('bla ble blu'); }` These alternatives may have different performance characteristics and may be more or less suitable depending on the specific use case. In summary, this benchmark is designed to compare the performance of two approaches for creating an array of strings and joining them together: using `Array.prototype.map()` with string concatenation versus using `Array.from()`. The results indicate that `Array.from()` is more efficient in this specific case.
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