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Array.from() vs new A
(version: 0)
Testing the difference between creating filled arrays.
Comparing performance of:
new Array() vs Array.from()
Created:
2 years ago
by:
Guest
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Tests:
new Array()
new Array(500)
Array.from()
Array.from({ length: 500 })
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
new Array()
Array.from()
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 world of JavaScript microbenchmarks on MeasureThat.net. **What is being tested?** The provided benchmark tests two approaches to creating filled arrays: 1. `new Array(500)`: This method creates an array with 500 elements, all initialized to `undefined`. 2. `Array.from({ length: 500 })`: This method creates a new array by converting the object `{ length: 500 }` into an array. **Options being compared** The two options are compared in terms of their performance, which is measured by the number of executions per second (ExecutionsPerSecond). **Pros and Cons of each approach** 1. `new Array(500)`: * Pros: Simple, widely supported, and easy to understand. * Cons: May not be as efficient as other methods, especially for large arrays, since it creates a new array object with 500 elements. 2. `Array.from({ length: 500 })`: * Pros: More modern and efficient approach, as it leverages the optimized `Array.from()` method in JavaScript engines. This method also avoids creating unnecessary objects or garbage. * Cons: Requires support for the `Array.from()` method in older browsers or environments. **Library used** In this benchmark, there is no explicit library being tested. However, the `Array.from()` method relies on a feature introduced in ECMAScript 2015 (ES6) and has been widely supported by modern browsers since then. **Special JS feature/syntax** The use of `Array.from({ length: 500 })` requires knowledge of ES6 features, specifically the spread operator (`{ ... }`) and the `Array.from()` method. This syntax is not widely supported in older JavaScript environments or browser versions prior to Chrome 33 (released in 2015). **Other alternatives** If `new Array(500)` were not being used, other alternative approaches could include: 1. Using a array literal with 500 elements: `[...new Array(500)]` 2. Creating an array using the `Array()` constructor and then filling it with values 3. Using a library like Lodash or Ramda to create an array However, these alternatives are not being tested in this specific benchmark. I hope this explanation helps software engineers understand what's happening behind the scenes of this JavaScript microbenchmark!
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