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array fill 10000
(version: 1)
compare some iterated array from size
Comparing performance of:
1 vs 2 vs 3
Created:
2 years ago
by:
Registered User
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Tests:
1
Array(10000).fill(undefined)
2
[...Array(10000)]
3
Array.from({ length: 10000 })
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
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Result
1
2
3
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided JSON and explain what is tested, compared, and other considerations. **Benchmark Definition** The benchmark definition is simply an array of JavaScript expressions that fill an array with a specific value (in this case, `undefined`, `0`, or another number). The purpose of these benchmarks is to compare the performance of different ways to create and fill arrays in JavaScript. **Options Compared** Three options are compared: 1. `Array(10000).fill(undefined)`: * This method creates an array with 10,000 elements, each set to `undefined`. * Pros: Simple and concise. * Cons: May be slower due to the use of the `fill()` method, which is a more general-purpose operation. 2. `[...Array(10000)]`: * This method uses the spread operator (`[...]`) to create an array with 10,000 elements. * Pros: More concise and expressive than using the `fill()` method. * Cons: May be slower due to the use of the spread operator, which can involve additional function calls. 3. `Array.from({ length: 10000 })`: * This method uses the `Array.from()` method to create an array with 10,000 elements. * Pros: More efficient than using the `fill()` or spread operator methods, as it creates a new array without modifying the existing one. * Cons: May be less concise and more verbose than other options. **Other Considerations** When choosing between these options, consider the following factors: * Readability: `[...Array(10000)]` is often considered the most readable option due to its concise syntax. * Performance: `Array.from({ length: 10000 })` may be the fastest option due to its efficiency in creating a new array without modifying the existing one. * Browser support: All three options are supported by modern browsers, but `fill()` and spread operator methods might be slower or less efficient in older browsers. **Libraries** None of the provided benchmarks use any external libraries. However, if you're interested in using libraries for similar benchmarking tasks, some popular options include: * Benchmark.js: A lightweight library for measuring JavaScript performance. * Microbenchmark: A Node.js module for running microbenchmarks and measuring performance. **Special JS Features or Syntax** The `fill()` method was introduced in ECMAScript 5 (ES5) and is still widely supported today. The spread operator (`[...]`) was introduced in ECMAScript 2015 (ES6). Both are relatively stable features, but if you're targeting older browsers, you may need to use alternative methods or polyfills. In summary, the benchmarks provide a good starting point for comparing the performance of different ways to create and fill arrays in JavaScript. When choosing an option, consider readability, performance, and browser support.
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