How to append to a JavaScript array dynamically?

Question

Possible Duplicate:
How do I create Javascript array(JSON format) dynamically?

I am attempting to create the following:

var employees = {"accounting": [   // accounting is an array in employees.
                    { "firstName" : "John",  // First element
                      "lastName"  : "Doe",
                      "age"       : 23 },

                    { "firstName" : "Mary",  // Second Element
                      "lastName"  : "Smith",
                      "age"       : 32 }
                  ] // End "accounting" array.                                  

    } // End Employees

I started out with:

 var employees=new Array();

How do I continue to append to the array dynamically (might change firstName with variable)?

even the description is same... as above duplicate question! — Sudhir Bastakoti, Aug 22 '12 at 06:09
The fact that you've received 5 upvotes for this question and [9 upvotes on this **identical question**](http://stackoverflow.com/questions/2250953/how-do-i-create-javascript-arrayjson-format-dynamically) is *extremely* suspicious. — user229044, Aug 22 '12 at 13:56

score 7 · Answer 1 · answered Aug 22 '12 at 06:08

7

var employees = {accounting: []};

employees.accounting.push({
    "firstName" : "New",
    "lastName"  : "Employee",
    "age"       : 18
});

answered Aug 22 '12 at 06:08

Lucas Green

3,951
22
27

Perfect, thanks! Will accept in a few minutes – Michael Anderson Aug 22 '12 at 06:09
On a side note there is good reason so many JavaScripters use array literals besides just their terseness, the variadic signature of new Array() is confusing. – Lucas Green Aug 22 '12 at 06:14
https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/Array Notice that if you pass a single Number it interprets it as a default length for the array, where if you pass two Numbers, it treats it like the first two elements of the array. – Lucas Green Aug 22 '12 at 06:16
1

_"the variadic signature of new Array() is confusing"_ - And in this case `employees` isn't even supposed to be an array, it's an object... – nnnnnn Aug 22 '12 at 06:20

score 2 · Answer 2 · answered Aug 22 '12 at 06:08

2

employees.accounting.push({ "firstName" : "New",  // First element
                      "lastName"  : "Person",
                      "age"       : 55 });

answered Aug 22 '12 at 06:08

George.P

53
4

score 0 · Answer 3 · answered Aug 22 '12 at 06:11

0

var urNewFirstName='new john';
employees.accounting[0].firstName = urNewFistName;

answered Aug 22 '12 at 06:11

RAKESH HOLKAR

2,127
5
24
42

score 0 · Answer 4 · answered Aug 22 '12 at 06:12

function Employee(firstName, lastName, age) {
  this.firstName = firstName;
  this.lastName = lastName;
  this.age = age;
}

var employees = {};
employees.accounting = [];
employees.accounting.push(new Employee('John', 'Doe', 23));
employees.accounting.push(new Employee('Mary', 'Smith', 32));

How to append to a JavaScript array dynamically?

4 Answers4