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Length validation
(version: 0)
Comparing performance of:
lenFromVar() vs lenFromMethod()
Created:
5 years ago
by:
Guest
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Tests:
lenFromVar()
class Length { constructor() { this.arr = [1, 2, 3, 4, 5]; this.lenArr = this.arr.lenght; } lenFromVar() { return this.lenArr; } } const obj = new Length(); obj.lenFromVar();
lenFromMethod()
class Length { constructor() { this.arr = [1, 2, 3, 4, 5]; this.lenArr = this.arr.lenght; } lenFromMethod() { return this.arr.length; } } const obj = new Length(); obj.lenFromMethod();
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Suite status:
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Test case name
Result
lenFromVar()
lenFromMethod()
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down what's being tested in the provided JSON benchmark. **Benchmark Definition** The benchmark is defined as a JavaScript microbenchmark that tests two different ways of accessing an array length: using a variable (`lenArr`) and using a method (`length`). The `Length` class has two methods: `lenFromVar()` and `lenFromMethod()`. The first method accesses the array length through a variable, while the second method uses a built-in method on the array object. **Options Compared** Two options are being compared: 1. **Using a variable (`lenArr`)**: This approach stores the result of `arr.length` in a variable and then returns that value. 2. **Using a method (`length`)**: This approach calls the built-in `length` property on the array object to get its length. **Pros and Cons** **Using a variable (`lenArr`):** Pros: * Can be faster, as it avoids the overhead of calling a method * May be more cache-friendly, as the value is stored in memory Cons: * Requires an additional operation to store the result in a variable * May not be as readable or intuitive for some developers **Using a method (`length`):** Pros: * More readable and intuitive, as it clearly conveys the intent of accessing an array length * Built-in methods are often optimized for performance Cons: * May be slower due to the overhead of calling a method * May not be cache-friendly, as the result is computed on the fly each time **Other Considerations** The benchmark also takes into account the **browser**, **device platform**, and **operating system**. This suggests that the results may vary depending on these factors. If we were to add more test cases, we might want to consider: * Using a different data structure, such as an object or a set * Adding noise to the input data to simulate real-world scenarios * Testing for performance differences in other areas of JavaScript, such as parsing or string manipulation **Library and Special JS Features** There are no libraries being used in this benchmark. However, it's worth noting that some browsers may use proprietary methods or properties that aren't part of the standard JavaScript API. As for special JavaScript features, there isn't anything unusual here. The `length` property is a built-in feature, and the variable assignment (`this.lenArr = this.arr.length;`) is also a standard operation in JavaScript. **Other Alternatives** Some alternative approaches to accessing an array length could include: * Using a function expression: `function getLength(arr) { return arr.length; }` * Using a helper function: `getArrayLength(arr) { return arr.length; }` * Using a library like Lodash, which provides a `_.length` method for arrays However, in this specific benchmark, the built-in `length` property and variable assignment are being compared to two different approaches.
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