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filling
(version: 0)
Comparing performance of:
1 vs 2
Created:
8 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
var n = 1000; var arr;
Tests:
1
for(var i=n-1, arr=[i]; i--; arr.unshift(i));
2
const arr = Array(n).fill().map((_,i)=>i)
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
1
2
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'd be happy to explain the benchmark and its options. The provided JSON represents a JavaScript microbenchmark on MeasureThat.net, which is designed to compare different approaches for creating an array in JavaScript. **Benchmark Definition:** The benchmark definition includes two test cases: 1. `for(var i=n-1, arr=[i]; i--; arr.unshift(i));` 2. `const arr = Array(n).fill().map((_,i)=>i)` These two test cases are designed to create an array of size `n` using different approaches. **Options Compared:** The benchmark compares the performance of two options: 1. **Manual array creation with a for loop**: This approach creates an array by manually iterating over the range from 0 to `n-1`, and then uses the `unshift()` method to add each element to the end of the array. 2. **Using the Array constructor with fill() and map()**: This approach uses the `Array` constructor, which is a built-in JavaScript function that creates an empty array. The `fill()` method is used to populate the array with `n` elements, and then the `map()` method is used to create a new array with the desired elements. **Pros and Cons:** **Manual Array Creation with a for loop:** Pros: * Simple and easy to understand * No additional libraries or dependencies required Cons: * Can be slow and inefficient due to the use of the `unshift()` method, which has to shift all elements in the array * May not handle edge cases well, such as when the input size is very large **Using the Array constructor with fill() and map():** Pros: * Fast and efficient, especially for larger inputs * Handles edge cases well, since the `Array` constructor is designed to handle a wide range of input sizes Cons: * Requires the use of built-in JavaScript functions, which may not be familiar to some developers * May require more memory to create the intermediate arrays used by `fill()` and `map()` **Other Considerations:** * The benchmark uses a large input size (`n = 1000`) to ensure that any performance differences are significant. * The use of `const` and `let` keywords for variable declarations is not mentioned in the benchmark definition, but it's worth noting that these keywords can affect the behavior of JavaScript code. **Library/External Function:** The library used here is none.
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