Add element to array like json

Question

I get the following error on data.push. Why?

Uncaught TypeError: undefined is not a function

when doing this in javascript

var data = ({"name": "button", "value": "delete"});
data.push({"id": 456});

console.log(data);

$.ajax({
    type: ...
    url: ...
    data: data,
    dataType: "json"
}).done(function(data) {
    ...
}).fail(function(data) {
    ...
});

Answer 1

Try this instead. Your data is an object, not an array:

var data = {"name": "button", "value": "delete"};
data.id = 456;
console.log(data);

http://jsfiddle.net/orf40c66/

Somewhat related: How to set a Javascript object values dynamically?

Answer 2

Actually data is not an array, but an object. Array must be declared inside square brackets.

var data = [{"name": "button", "value": "delete"}];
console.log(data);

Answer 3

push is a method for arrays, not objects