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Array fill method vs for loop_q
(version: 0)
Array fill method vs for loop performance validation
Comparing performance of:
For Loop fill vs Array Fill
Created:
4 years ago
by:
Guest
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Tests:
For Loop fill
let arrayTest = new Array(10); for (let i = 0, l = arrayTest.length; i < l; ++i)arrayTest[i] = true;
Array Fill
let arrayTest = new Array(10).map(a=>true);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
For Loop fill
Array Fill
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the explanation of the provided benchmark. **Benchmark Overview** The benchmark compares two ways to fill an array with a specific value in JavaScript: using a `for` loop and using the `Array.prototype.fill()` method or `Array.from()`. The goal is to measure which approach is faster. **Options Compared** Two options are compared: 1. **For Loop**: A traditional `for` loop approach, where an index variable `i` is used to iterate over the array and assign a value (`true`) to each element. 2. **Array Fill/From**: Using either the `Array.prototype.fill()` method or `Array.from()`, which are modern JavaScript methods that can fill an array with a specified value. **Pros and Cons** Here's a brief analysis of each approach: * **For Loop**: + Pros: Simple, straightforward, and well-understood by many developers. + Cons: May not be the most efficient way to fill an array, especially for larger arrays. * **Array Fill/From**: + Pros: Efficient and scalable for large arrays. Reduces boilerplate code and is often preferred in modern JavaScript development. + Cons: Less intuitive or well-known by some developers. **Library Usage** There are no libraries used in this benchmark. The comparison is solely based on the two JavaScript approaches mentioned above. **Special JS Features/Syntax** The `let` declaration, arrow functions (`=>`), and template literals (used in the `Array.from()` example) are modern JavaScript features used in the benchmark. **Other Alternatives** If you're looking for alternative ways to fill an array, consider: * **Array.prototype.map()**: Similar to `fill()`, but returns a new array with the specified value applied to each element. (Not used in this benchmark) * **Closures**: Using closures to create arrays can be another approach. However, this is generally less efficient and less straightforward than using `fill()` or `from()`. * **Other libraries**: Depending on your use case, you might consider using a library like `lodash` which provides an `array.fill()` method. **Benchmark Preparation Code** The provided script preparation code (`let arrayTest = new Array(10);`) is used to create an empty array for the `For Loop` test. The HTML preparation code is not provided, suggesting that the benchmark uses a simple web page without any external dependencies. In summary, this benchmark measures the performance difference between two ways to fill an array: using a traditional `for` loop and using modern JavaScript methods like `Array.prototype.fill()` or `Array.from()`.
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