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new array vs array.length = 0
(version: 0)
Comparing performance of:
new array vs array.length = 0
Created:
2 years ago
by:
Registered User
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Tests:
new array
let a = [0, 1, 2, 3] a = []
array.length = 0
let a = [0, 1, 2, 3] a.length = 0
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
new array
array.length = 0
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'll break down the explanation into smaller, manageable parts. **Benchmark Definition JSON and Benchmark Preparation Code** The benchmark definition JSON provides essential metadata about the test case: * `Name`: The name of the test case (e.g., "new array vs array.length = 0"). * `Description` and `Html Preparation Code`: These fields are empty in this example, indicating that no description or HTML setup is required for the benchmark. * `Script Preparation Code`: Also empty, suggesting that there's no script preparation needed before running the test. **Individual Test Cases** Two individual test cases are defined: 1. **"new array"`**: This test case measures the time it takes to create a new JavaScript array using the syntax `let a = [0, 1, 2, 3]\r\na = []`. The purpose of this test is likely to evaluate how JavaScript engines execute array literals and how they handle reassignments. 2. **"array.length = 0"`**: This test case measures the time it takes to set the `length` property of an existing array to zero using the syntax `let a = [0, 1, 2, 3]\r\na.length = 0`. The goal here is probably to assess how JavaScript engines handle changes to an array's size and how they optimize this operation. **Library Used in Test Cases** There are no libraries explicitly mentioned in these test cases. However, when running a benchmark like this, it's common to use a library that can dynamically create arrays or modify their sizes. Some popular choices include: * `Array.from()` * `Array.prototype.splice()` * `Array.prototype.fill()` **Special JavaScript Features/Syntax** The test cases don't utilize any special JavaScript features or syntax. The focus is on measuring the execution time of simple array operations. **Other Alternatives** If you wanted to create similar benchmarks, here are some alternatives: 1. **Measure the execution time of `Array.prototype.slice()` vs. `Array.prototype.subarray()`:** * Measure how JavaScript engines compare these two methods for creating a shallow copy of an array. 2. **Compare the performance of different array initialization methods:** * Create benchmarks for initializing arrays using `Array.from()`, `Array.from(new Int32Array())`, or other methods, to evaluate their performance and any differences in optimization strategies between browsers. **Additional Considerations** When creating benchmarks like this, keep the following points in mind: * **Keep it simple:** Start with basic operations and gradually move on to more complex scenarios. * **Test a variety of inputs:** Ensure that your benchmark covers different types of input data (e.g., empty arrays, large arrays, arrays with different element types). * **Use multiple browsers and platforms:** Running benchmarks across various browsers and devices can help identify platform-specific differences in performance. By following these guidelines, you can create accurate and informative benchmarks that provide valuable insights into JavaScript engine behavior.
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Array(length).fill() vs Array.from({ length: length })
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