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ForOf+Push vs Map
(version: 0)
Comparing performance of:
For of + Push vs Map
Created:
4 years ago
by:
Guest
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Script Preparation code:
var objs = Array.from(new Array(1000000)).map(() => ({ prop: 'hi'})) var result = []
Tests:
For of + Push
for (let x of objs) { result.push(x.prop) }
Map
result = objs.map(x => x.prop)
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
For of + Push
Map
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 benchmark and explain what's being tested. **Benchmark Overview** The benchmark compares the performance of two approaches to iterate over an array of objects and push their properties into another result array: 1. Using a traditional `for` loop with a `forEach`-style iteration (`ForOf + Push`) 2. Using the `Array.prototype.map()` method **Options Compared** These are the two options being compared, each with its pros and cons: ### ForOf + Push Pros: * Easy to understand and implement * No need for external libraries or dependencies * Can be used in older browsers that don't support modern array methods Cons: * Can lead to slower performance due to repeated function calls and array indexing * May not scale well with large arrays ### Map Pros: * Native support on modern browsers, providing better performance and security features * Can handle complex transformations of data without requiring explicit loops * Often more concise and readable than traditional `for` loops Cons: * May require additional setup or dependencies for older browsers * Can lead to slower performance if not optimized properly **Library Used** In this benchmark, the `Array.prototype.map()` method is used. This method applies a specified function to each element of an array and returns a new array with the results. It's a powerful tool in JavaScript that can simplify many iteration tasks. **JavaScript Features/Syntax Used** The benchmark uses modern JavaScript features like: * **Arrow functions**: Simplified syntax for defining small, single-expression functions (e.g., `x => x.prop`). * **Template literals**: Used to create string literals with interpolated values (`var result = []`). **Other Alternatives** If you're interested in exploring alternative approaches, consider the following: * Using a traditional `for` loop with array indexing: `for (let i = 0; i < objs.length; i++) { result.push(objs[i].prop) }` * Utilizing other array methods like `Array.prototype.forEach()` or `Array.prototype.reduce()` * Leveraging modern JavaScript features like `Promise.all()` for parallel processing Keep in mind that the performance differences between these approaches can be significant, especially with large datasets. When choosing an approach, consider factors such as: * Performance requirements * Browser support * Code readability and maintainability * Development time and expertise
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