How add new element to an existing object with array.map()

03 Nov 2016

The map() method creates a new array with the results of calling a function for every array element.

arr.map(callback[, thisArg])

var array = [ 

    { end_date: '01/11/2012',
    key: '101',
    address: 'Felipe Villanueva',
    zip: '1040',
    company: 'Vendor',
    start_date: '01/09/2012' },

    { end_date: '01/11/2012',
    key: '102',
    address: 'Felipe Villanueva',
    zip: '1040',
    company: 'Vendor',
    start_date: '01/09/2012' },

    { end_date: '01/11/2012',
    key: '103',
    address: 'Felipe Villanueva',
    zip: '1042',
    company: 'Vendor',
    start_date: '01/09/2012' } 
];

//function for add new item
const newArr = array.map(function (item) {
  item.status = 'new item'
  return item
})

console.log(array)

Result:

var array = [ 

    { end_date: '01/11/2012',
    key: '101',
    address: 'Felipe Villanueva',
    zip: '1040',
    company: 'Vendor',
    status : 'new item',
    start_date: '01/09/2012' },

    { end_date: '01/11/2012',
    key: '102',
    address: 'Felipe Villanueva',
    zip: '1040',
    company: 'Vendor',
    status : 'new item',
    start_date: '01/09/2012' },

    { end_date: '01/11/2012',
    key: '103',
    address: 'Felipe Villanueva',
    zip: '1042',
    company: 'Vendor',
    status : 'new item',
    start_date: '01/09/2012' } 

];

View console

demo

Valentin Antonio Bautista

How add new element to an existing object with array.map()