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Javascript objet.assign

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const obj = { a: 1 };
const copy = Object.assign({}, obj);
console.log(copy); // { a: 1 }
var x = {key: 'value'}
var y = JSON.parse(JSON.stringify(x))

//this method actually creates a reference-free version of the object, unlike the other methods
//If you do not use Dates, functions, undefined, regExp or Infinity within your 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 }
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 }
// Object assign in javascript
let fname = { firstName : 'Black' };
let lname = { lastName : 'Panther'}
let full_names = Object.assign(fname, lname);
console.log(full_names); //{ firstName: 'Black', lastName: 'Panther' }
const newId= tours[tours.length-1].id+1;
const newTour= Object.assign({id:newId},req.body) //object.assign() is used to merge two objects.