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array from
(version: 0)
Benchmark.js
Comparing performance of:
Array.from({...}) vs Array.from(Array())
Created:
3 years ago
by:
Guest
Go to the latest result
Tests:
Array.from({...})
Array.from({ length: 1000 }, () => 0)
Array.from(Array())
Array.from(Array(1000), () => 0)
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
Array.from({...})
Array.from(Array())
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
one year ago
)
User agent:
Mozilla/5.0 (iPhone; CPU iPhone OS 16_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) FxiOS/137.0 Mobile/15E148 Safari/605.1.15
Browser/OS:
Mobile Safari 16 on iOS 16.2
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<iframe src="https://measurethat.net/Embed?id=598378" width="100%" height="500px"></iframe>
Array.from({...})
83K/s
Array.from(Array())
53K/s
View exact numbers
Test name
Executions per second
✓
Array.from({...})
82,864 Ops/sec
Array.from(Array())
52,805 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark and explain what's being tested. The test case uses the `Array.from()` method, which is a JavaScript array creation method that creates a new array from an iterable (such as an array or string) by mapping each element to a new value. The purpose of this method is to provide a concise way to create arrays with a specific number of elements. In this benchmark, there are two test cases: 1. `Array.from(Array(1000), () => 0)`: This test case creates an array of 1000 elements using the `Array` constructor and then passes it as an argument to `Array.from()`. The callback function `(x) => 0` is used to map each element to a new value, which is always 0. This test case measures how fast `Array.from()` can create an array from a pre-existing array. 2. `Array.from({ length: 1000 }, () => 0)`: This test case creates an object with a specific number of properties (1000) using the `{ length: 1000 }` syntax, and then passes it as an argument to `Array.from()`. The callback function `(x) => 0` is used to map each property to a new value. This test case measures how fast `Array.from()` can create an array from an object. Now, let's discuss the options being compared: **Option 1: Pre-existing Array** Using a pre-existing array as input for `Array.from()`. This approach has pros and cons: Pros: * Fast creation of an array * Easy to generate arrays with specific sizes Cons: * Requires extra memory allocation (to store the original array) * May not be as efficient if the original array is large **Option 2: Object with Specific Properties** Using an object with a specific number of properties as input for `Array.from()`. This approach has pros and cons: Pros: * Does not require extra memory allocation * Can be more efficient than using pre-existing arrays, especially for large inputs Cons: * Requires a deeper understanding of objects and their syntax * May not be as straightforward to generate arrays with specific sizes Other considerations: * Performance: Both options have similar performance characteristics, but the object-based approach might be slightly faster due to reduced memory allocation. * Memory usage: The pre-existing array approach requires more memory allocation than the object-based approach. Regarding the libraries used in this benchmark, none are explicitly mentioned. However, it's worth noting that `Array.from()` is a built-in JavaScript method and does not rely on any external libraries. As for special JavaScript features or syntax, this benchmark uses a few: * The `{ length: 1000 }` syntax to create an object with specific properties. * The callback function `(x) => 0` used in both test cases. If you're interested in exploring alternative approaches or testing other scenarios, here are some suggestions: * Use different array creation methods (e.g., `Array.from()`, `Array.prototype.fill()`, `Array.from(0)`). * Test with varying input sizes to see how performance changes. * Experiment with different object syntaxes (e.g., `{ prop1: 1, prop2: 2 }`) and see if they affect performance. Keep in mind that these alternatives might not be directly related to the specific questions being asked by this benchmark.
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