What are some practical use cases for JavaScript's Object.assign()?

What are some practical use cases for JavaScript's Object.assign()?

JavaScript's Object.assign() is used to copy values from one or more source objects to a target object. Here are some use cases:

1. Merging objects: Combine multiple objects into one.
2. Cloning objects: Create a shallow copy of an object.
3. Default values: Set default values for an object by merging it with another object.

Can you give me an example of merging objects?

Sure! Here's an example:

const obj1 = { a: 1, b: 2 };
const obj2 = { b: 3, c: 4 };
const merged = Object.assign({}, obj1, obj2);
console.log(merged); // Output: { a: 1, b: 3, c: 4 }

In this case, properties from obj2 overwrite those in obj1.

What about cloning an object?

To clone an object, you can do the following:

const original = { a: 1, b: 2 };
const clone = Object.assign({}, original);
console.log(clone); // Output: { a: 1, b: 2 }

This creates a shallow copy of the original object.

Are there any limitations to using Object.assign()?

Yes, Object.assign() only performs a shallow copy, meaning nested objects are not cloned. If you need a deep copy, consider using libraries like Lodash or structured cloning.