Скачать или смотреть Copy an Object with Object.assign

In Redux, Object.assign() was a common method used to ensure immutability when updating state. Redux's core principle dictates that state should never be directly mutated; instead, new copies of state objects or arrays should be created with the desired changes.

How Object.assign() was used in Redux:
Creating shallow copies:
Object.assign({}, originalObject) creates a new, shallow copy of originalObject. The empty object {} as the first argument serves as the target, preventing mutation of the original object.

Merging and updating properties:
Object.assign({}, originalObject, { newProperty: value }) combines the properties of originalObject with new or updated properties from the subsequent source objects. If properties have the same name, the value from the rightmost source object takes precedence.

Transition to Spread Syntax:
While Object.assign() is still valid, the ES6 object spread syntax (...) has largely replaced it in modern Redux applications due to its conciseness and readability. The spread operator achieves the same immutability by creating new objects with copied and updated properties.

In essence, Object.assign() provided a mechanism for immutable state updates in Redux, but the object spread syntax is now the preferred and more idiomatic approach for achieving the same goal.