What are some examples of immutable objects in JavaScript?

What are some examples of immutable objects in JavaScript?

In JavaScript, immutable objects are those that cannot be changed after they are created. Examples include strings, numbers, and objects created with Object.freeze().

Can you show me how to create an immutable object?

Sure! You can create an immutable object using Object.freeze(). Here's an example:

const person = Object.freeze({ name: 'Alice', age: 30 });
// person.age = 31; // This will not change the age property

What happens if I try to modify a frozen object?

If you try to modify a frozen object, JavaScript will silently fail in non-strict mode or throw an error in strict mode. For example:

'use strict';
const person = Object.freeze({ name: 'Alice', age: 30 });
person.age = 31; // This will throw an error in strict mode

Are there libraries that help with immutable data structures?

Yes, libraries like Immutable.js and Immer provide powerful tools for working with immutable data structures in JavaScript.