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Non-destructive Object.assign vs spread operator
(version: 0)
Non-destructive Object.assign vs spread operator
Comparing performance of:
spread operator vs Non-destructive Object.assign
Created:
4 years ago
by:
Guest
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Tests:
spread operator
const first = { a: 'a' } const second = { b: 'b' } const result = { ...first,...second };
Non-destructive Object.assign
const first = { a: 'a' } const second = { b: 'b' } const result = Object.assign({}, first, second);
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Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
spread operator
Non-destructive Object.assign
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 what's being tested on the provided JSON. The benchmark is comparing two approaches for creating a new object by merging two existing objects: `Object.assign` with an object literal (non-destructive) and the spread operator (`...`). **Non-destructive Object.assign** This approach creates a shallow copy of the original object, where only the properties from the second object are added. The first object remains unchanged. Pros: * Preserves the original object's properties. * Can be useful when you want to create a new object that doesn't modify the original. Cons: * Creates a new object with references to the same properties as the original object, which can lead to unexpected behavior if the original object is modified later. * May not work correctly for nested objects or arrays. **Spread Operator (`...`)** This approach creates a new object by copying all properties from both objects. Pros: * Creates a completely new object with separate copies of each property. * Works well for nested objects and arrays. * Can be more efficient than `Object.assign` when dealing with large amounts of data. Cons: * May not preserve the original object's structure or behavior if it relies on references to the same properties. * Requires JavaScript version 2015 or later (ECMAScript 6) to use. In this benchmark, we have two test cases: 1. "spread operator": Tests the spread operator approach. 2. "Non-destructive Object.assign": Tests the non-destructive `Object.assign` approach. The benchmark results show that both approaches perform similarly in Firefox 99 on a desktop Mac running macOS 10.15. However, without more context or additional tests, it's difficult to determine which approach is generally better for all use cases. Other alternatives include: * Using `lodash.extend()` or other utility libraries that provide their own implementation of object merging. * Using JSON merge functions like `jsonmerge` or `immer`. * Implementing your own custom function for object merging. Keep in mind that the choice of approach depends on the specific requirements and constraints of your project.
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