Push into array object

Question

test = [{
 property1: "value 1",
 property2: "value 2"
 }];

if I do this

test.push[{property3: "value 3"}];

I get a new object. I want to add it to existing object.

How can I do this?

Answer 1

test[0].property3 = "value 3";

or

test[0]['property3'] = "value 3";