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forinvsforof
(version: 0)
Comparing performance of:
forin vs forof
Created:
5 years ago
by:
Guest
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Tests:
forin
const options = { key1:{x:1}, key2:{x:1}, key3:{x:1}, key4:{x:1}, } for(const key in options){ const v = options[key] console.log(v) }
forof
const options = { key1:{x:1}, key2:{x:1}, key3:{x:1}, key4:{x:1}, } for(const v of Object.values(options)){ console.log(v) }
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Suite status:
<idle, ready to run>
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Test case name
Result
forin
forof
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 provided JSON data and explain what's being tested, compared, and the pros and cons of each approach. **Benchmark Overview** The provided JSON defines two microbenchmarks: `forin` and `forof`. Both benchmarks test the performance of iterating over an object using different approaches. **Options Being Compared** The two options being compared are: 1. **Traditional `for...in` loop**: This approach iterates over the object's own enumerable properties (i.e., key-value pairs) using the `for...in` statement. 2. **`for...of` loop with `Object.values()`**: This approach uses the `Object.values()` method to get an array of the object's values and then iterates over it using a traditional `for...of` loop. **Pros and Cons** 1. **Traditional `for...in` loop**: * Pros: Simple, widely supported, and easy to understand. * Cons: May iterate over inherited properties, which can lead to unexpected behavior or performance issues. 2. **`for...of` loop with `Object.values()`**: * Pros: More efficient, as it avoids iterating over inherited properties and only iterates over the object's own values. * Cons: Requires modern JavaScript (ES6+) support and may not work in older browsers. **Library Usage** None of the provided benchmark definitions use any external libraries. However, `Object.values()` is a built-in method introduced in ECMAScript 2017 (ES7). **Special JS Features or Syntax** Neither of the benchmarks uses any special JavaScript features or syntax beyond ES6+ support for `for...of` loops and `Object.values()`. **Alternative Approaches** Other alternative approaches to iterate over an object could include: * Using `forEach()`: This method is also a built-in method introduced in ECMAScript 2015 (ES6+) and can be used as an alternative to `for...in` and `for...of`. * Using `map()` or `reduce()`: These methods can be used to transform the object's values, but may not provide the same level of iteration performance as a traditional loop. **Benchmark Preparation Code** The provided JSON doesn't include any script preparation code, which means that the benchmark is designed to be run directly in the browser without any additional setup or dependencies.
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