object assign

const obj = { a: 1 };
const copy = Object.assign({}, obj);
console.log(copy); // { a: 1 }

//Object.assign() method is for copying methods/props of one object to another
//creating 3 object constructors and assigning values to it
var obj1 = { a: 10 }; 
var obj2 = { b: 20 }; 
var obj3 = { c: 30 }; 
  
//creating target object and copying values and properties to it using object.assign() method
var new_obj = Object.assign({}, obj1, obj2, obj3); 
  
//Displaying the target object
console.log(new_obj); 

The Object.assign() method copies all enumerable own properties from one or more source objects to a target object. It returns the target object.
const target = { a: 1, b: 2 };
const source = { b: 4, c: 5 };

const returnedTarget = Object.assign(target, source);

console.log(target);
// expected output: Object { a: 1, b: 4, c: 5 }

console.log(returnedTarget);
// expected output: Object { a: 1, b: 4, c: 5 }

const target = { a: 1, b: 2 };
const source = { b: 4, c: 5 };

const returnedTarget = Object.assign(target, source);

console.log(target);
// expected output: Object { a: 1, b: 4, c: 5 }

console.log(returnedTarget);
// expected output: Object { a: 1, b: 4, c: 5 }

Object.assign