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Object assign vs regular assignment
(version: 0)
Comparing performance of:
Object.assign vs Assignment
Created:
3 years ago
by:
Guest
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Tests:
Object.assign
let firstObject = { sampleData: 'Hello world' }; firstObject = Object.assign({}, firstObject, { moreData: 'foo bar' });
Assignment
const firstObject = { sampleData: 'Hello world' }; firstObject.moreData = 'foo bar';
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Suite status:
<idle, ready to run>
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Test case name
Result
Object.assign
Assignment
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 benchmark and explain what's being tested, the options compared, pros and cons of each approach, and other considerations. **Benchmark Overview** The benchmark is testing two approaches for assigning values to an object: `Object.assign()` and regular assignment using the dot notation (`firstObject.moreData = 'foo bar';`). **Options Compared** 1. **Object.assign()**: A method that takes one or more source objects and assigns their properties to a target object. 2. **Regular Assignment (Dot Notation)**: Assigning values directly to the object's properties using the dot notation. **Pros and Cons of Each Approach** **Object.assign():** Pros: * Can handle nested objects and arrays with ease * Supports multiple sources * Can be used for deep cloning Cons: * May have performance overhead due to the method call * Returns a new object, rather than modifying the original one **Regular Assignment (Dot Notation):** Pros: * Typically faster since it's just a simple assignment operation * Does not create a new object or array Cons: * Can only handle direct property assignments * May not work well with nested objects and arrays **Other Considerations** * The benchmark uses JavaScript, which is a dynamically-typed language that can lead to unexpected behavior if not handled carefully. * The use of `const` for variable declaration indicates that the values are intended to be immutable. **Library Used (in this case, none)** No libraries are used in this benchmark. However, it's worth noting that some libraries like Lodash or Ramda provide utility functions for object manipulation, which could potentially impact performance. **Special JS Feature/Syntax** The benchmark does not explicitly use any special JavaScript features or syntax beyond the basics of object assignment and variable declaration (`const`). **Alternative Approaches** Other approaches to assigning values to an object might include: 1. **Spread Operator (`...`)**: A new feature introduced in ECMAScript 2018 that allows for direct spread assignment: `firstObject = { ...firstObject, moreData: 'foo bar' };` 2. **Object.create() and Object.assign() combination**: Creating a new object using `Object.create()` and then assigning values to it using `Object.assign()`. 3. **Method chaining**: Using the dot notation with multiple assignments in a chain: `firstObject = firstObject.sampleData = 'Hello world'; firstObject.moreData = 'foo bar';` Keep in mind that each of these alternatives might have different performance characteristics and implications for object manipulation. I hope this explanation helps!
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