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fill vs from vs from object
(version: 0)
Comparing performance of:
fill vs from vs from object
Created:
4 years ago
by:
Guest
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Tests:
fill
Array(10000).fill().map((_, i) => i+1)
from
Array.from(Array(10000), (_, i) => i+1)
from object
Array.from({length: 10000}, (_, i) => i+1)
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Suite status:
<idle, ready to run>
Run tests (3)
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Test case name
Result
fill
from
from object
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'd be happy to explain what's being tested in this benchmark. **Benchmark Overview** The benchmark measures the performance of three different approaches for creating an array of numbers: 1. `Array.fill()`: Fills an existing array with a specified value. 2. `Array.from()` without an object (i.e., only using the spread operator): Creates a new array from an iterable. 3. `Array.from()` with an object (i.e., using the `Object` constructor to create an object and then passing it to `Array.from()`: Creates a new array from an iterable. **Options Compared** The benchmark compares the performance of these three approaches: * **Pro's and Con's:** + `Array.fill()`: Pros: - Fast (since it's just filling an existing array with a value) - Simple to implement Cons: - Requires an existing array - Can be slow if the array is very large or complex + `Array.from()` without an object: Pros: - Fast (since it's using a V8-specific internal implementation that's optimized for performance) - Flexible (can create arrays from any iterable, including generators and promises) Cons: - Requires modern browsers (Chrome 97+) to use - Can be slower than `Array.fill()` if the input iterable is very large or complex + `Array.from()` with an object: Pros: - Flexible (can create arrays from any iterable, including objects) - Suitable for use cases where an existing array is not available Cons: - Slower than `Array.fill()` and the simple `Array.from()` - Requires more memory to store the object being created **Library/Functionality Used** In this benchmark, no external libraries or functions are used. However, it's worth noting that `Array.from()` is a built-in JavaScript function that was introduced in ECMAScript 2015. **Special JS Features/Syntax** There are no special JavaScript features or syntax being tested in this benchmark. The focus is on comparing the performance of different array creation approaches using standard JavaScript features. **Alternatives** If you're interested in exploring alternative approaches to creating arrays, here are a few options: * Using `Array.prototype.push()`: Instead of creating an array and then filling it with values, you could use `push()` to add elements to an existing array. This approach would require modifying the original array. * Using `Uint8Array` or other typed arrays: Depending on your specific use case, using a typed array like `Uint8Array` might be more efficient than creating an untyped array using `Array`. * Using `web Workers`: If you need to create very large arrays and are concerned about performance, you could consider using web workers to offload the array creation task to a separate thread. Keep in mind that these alternatives may not offer significant performance benefits over the approaches being compared in this benchmark.
Related benchmarks:
Array.from() vs new Array()
Array.from() vs new Array() - empty
Array(length).fill() vs Array.from({ length: length })
Array() vs Array.from() fill
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