Is it possible to add dynamically named properties to JavaScript object?

Question

Below is my JavaScript Object:

var data = {

    'PropertyA': 1,

    'PropertyB': 2,

    'PropertyC': 3

};

When the property name is not determined until runtime like below, can I add further properties to the object? 

var propName = 'Property' + someUserInput

//imagine someUserInput was 'Z', how can I now add a 'PropertyZ' property to 

//my object?

Answer 1

You can do it like below:

var data = {

    'PropertyA': 1,

    'PropertyB': 2,

    'PropertyC': 3

};

data["PropertyD"] = 4;

// dialog box with 4 in it

alert(data.PropertyD);

alert(data["PropertyD"]);

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