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Object assign vs Property change
(version: 0)
Comparing performance of:
assignation vs object.assign
Created:
4 years ago
by:
Guest
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Tests:
assignation
const emptyObject = { a : '-', b :'-' } const mainObject = { a : 'aylmao', b :'brrrr' } mainObject.a = emptyObject.a; mainObject.b = emptyObject.b;
object.assign
const emptyObject = { a : '-', b :'-' }; const mainObject = { a : 'aylmao', b :'brrrr' }; Object.assign(mainObject, emptyObject);
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Suite status:
<idle, ready to run>
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Test case name
Result
assignation
object.assign
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Measuring JavaScript performance is a crucial aspect of software development. Let's break down the provided benchmark and explain what's being tested. **Benchmark Overview** The benchmark compares two approaches to modify an object in JavaScript: 1. **Direct Property Modification**: Modifying properties directly on the `mainObject`. 2. **Using `Object.assign()`**: Using the built-in `Object.assign()` method to copy properties from another object (`emptyObject`) into `mainObject`. **Options Compared** The benchmark tests two options for modifying an object: * Option 1: Direct Property Modification (`mainObject.a = emptyObject.a;` and `mainObject.b = emptyObject.b;`) * Option 2: Using `Object.assign()` (`Object.assign(mainObject, emptyObject);`) **Pros and Cons of Each Approach** ### Direct Property Modification Pros: * Simple and easy to understand. * No additional function call overhead. Cons: * Can lead to unexpected behavior if the property values are objects themselves (e.g., arrays, functions). * May be slower due to the need to check for existing properties before assigning new ones. ### Using `Object.assign()` Pros: * Ensures that all properties from the source object (`emptyObject`) are copied into the target object (`mainObject`), even if they don't exist. * Can lead to more predictable behavior when dealing with complex objects. Cons: * Adds overhead due to the function call and the need to check for existing properties in the target object. * May be slower than direct property modification. **Library Usage** In this benchmark, there is no explicit library usage. However, it's worth noting that `Object.assign()` was introduced in ECMAScript 2015 (ES6) as a part of the standard language. **Special JS Feature/Syntax** There is no special JavaScript feature or syntax used in this benchmark. **Other Alternatives** Other approaches to modify an object could include: * Using the spread operator (`{ ...mainObject, ...emptyObject }`) to create a new object with merged properties. * Using the `lodash` library's `merge()` function to merge objects. * Using a custom implementation of property merging, such as using `for...in` loops to iterate over both objects and assign values. Keep in mind that these alternatives may not be relevant for this specific benchmark, which focuses on comparing two simple approaches to modify an object.
Related benchmarks:
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Spread vs Object.assign (modify ) vs Object.assign (new)
Object.assign vs direct copy
Object.assign() vs Reflect.set()
Object.assign vs mutation
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