Object.assign() -

The Object.assign() method copies properties from one or more source objects to a target object.

const obj1 = { a: 1, b: 2 };
const obj2 = { c: 3, d: 4 };

console.log(obj1, obj2)

// output: 1, 3, 4

Object.create() -

creates an object from an existing object. is a method in JavaScript that creates a new object, setting the prototype of the new object to an existing object. This allows the new object to inherit properties and methods from the prototype object.

const person = {
    greet: function(){
        console.log(`Hello my name is ${this.name}`);
    }
}

const john = Object.create(person);
john.name = 'John';
john.greet()

// Hello my name is John

Object.create() -

is a JavaScript method that allows you to define multiple properties on an object at once. You can specify each property's characteristics, such as whether it's writable, enumerable, or configurable.

const user = {};

Object.defineProperties(user, {
firstName: {
    value: 'John',
    writable: true, // Can be modified
    enumerable: true, // Will appear in loops
    configurable: true, // Can be deleted or change
    },
    age: {
    Value: 30,
    writable: false, // Cannot be modified
    enumerable: true, // Will appear in loops
    configurable: false, // Cannot be deleted or changed
    },
})

user.firstName = 'Alex' // output: Alex
user.age = 23 // output 30