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Object.assign vs direct assignment 313
(version: 0)
Comparing performance of:
Direct Assignment 31312321321 vs Object.assign 213123 vs test direct assignment 123213
Created:
4 years ago
by:
Guest
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Script Preparation code:
var data = {};
Tests:
Direct Assignment 31312321321
for(var i = 0; i < 10000; i++) { data[`prop_${i}`] = true; }
Object.assign 213123
for(var i = 0; i < 10000; i++) { var propName = `prop_${i}`; Object.assign(data, { [propName]: true }); }
test direct assignment 123213
Object.fromEntries( Array(10000) .fill(true) .map((value, index) => [index, value]), )
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
Direct Assignment 31312321321
Object.assign 213123
test direct assignment 123213
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's being tested. **Benchmark Definition** The first part of the JSON represents a benchmark definition, which is a simple JavaScript script that creates an object with properties named "prop_0", "prop_1", ..., "prop_9999". The script does not actually create any data; it only sets up a structure for future assignments or operations. **Test Cases** The second part of the JSON contains three test cases, each representing a different approach to assigning values to an object: 1. **Direct Assignment**: This test case uses a simple `for` loop to iterate 10,000 times and assign a value (`true`) to each property of the `data` object using dot notation (e.g., `data['prop_0'] = true;`). 2. **Object.assign**: This test case uses the `Object.assign()` method to create an object with properties from an array. It iterates 10,000 times and creates an array of objects with a single property (`{ [index]: true }`). The `Object.assign()` method is then used to assign these objects to the `data` object. 3. **test direct assignment**: This test case uses the `Array.fromEntries()` method (available in modern JavaScript) to create an array of key-value pairs and then passes it to `Object.fromEntries()`, which creates a new object from the array. **Options Compared** The three test cases are designed to compare the performance of different approaches for assigning values to an object: * Direct Assignment: A simple, straightforward approach using dot notation. * Object.assign: A method-based approach that uses the `Object.assign()` function to assign properties to an object. * test direct assignment: A modern, array-based approach using `Array.fromEntries()` and `Object.fromEntries()`. **Pros and Cons** Here are some pros and cons of each approach: 1. **Direct Assignment**: * Pros: Simple, easy to read, and maintain. * Cons: May be slower than other approaches due to the overhead of string interpolation (`data[`prop_${i}`] = true;`). 2. **Object.assign**: * Pros: Fast, efficient, and widely supported (available since ECMAScript 5). * Cons: Requires additional memory for the temporary object created by `Object.assign()`. 3. **test direct assignment**: * Pros: Modern, concise, and efficient. * Cons: May be less readable than other approaches due to its reliance on array methods. **Library or Special JS Feature** None of the test cases use a specific library or special JavaScript feature beyond the standard `Object.assign()` method. However, the `Array.fromEntries()` method is a modern JavaScript feature introduced in ECMAScript 2019. **Other Considerations** When running benchmarks like this, it's essential to consider factors such as: * Garbage collection: How does each approach affect garbage collection and memory allocation? * Compiler optimizations: Are there any compiler optimizations that can improve or degrade performance for one approach over another? * Browser support: Is the benchmarking code executed on a specific browser or platform? **Alternatives** Other alternatives to these approaches might include: * Using a library like Lodash to perform object assignment operations. * Implementing custom loop optimization techniques, such as unrolling loops or using SIMD instructions. * Using a specialized framework or engine that provides optimized performance for common JavaScript operations. Keep in mind that the specific alternatives will depend on the requirements and constraints of your use case.
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