Javascript expression to define object's property name?

Question

I'd like to create this object...

object = {
  'object[1][var_name_1]' : 'value1',
  'object[1][var_name_2]' : 'value2',
};

I'm trying to it this way, but I'm getting error missing : after property id...

function getPrefix() {
  return 'object[1]';
}

object = {
  getPrefix() + '[var_name_1]' : 'value1',
  getPrefix() + '[var_name_2]' : 'value2',
}

What am I doing wrong? Or maybbe it is impossible to set object property name using js experession?

Thank you

possible duplicate of Using a variable for a Javascript object key — Bergi
– Bergi, Commented Apr 15, 2013 at 0:18

Jakob · Accepted Answer · 2010-05-18 08:14:38Z

5

You cant set variable properties using literal syntax, but you can set properties using [], after you've created the object:

myObject = {}
myObject["any_string_here"] = myValue

answered May 18, 2010 at 8:14

Jakob

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Comments

Tim Down · Accepted Answer · 2010-05-18 08:13:36Z

3

In an object literal, each property name can only be identifier rather than an expression, which means you can't use variables. You can only use the square bracket notation on an existing object, so if you have a variable you wish to use as a property name then you'll need to do it after the object is created:

var object = {
    '1': {};
};

object[1][var_name_1] = 'value1';
object[1][var_name_2] = 'value2';

answered May 18, 2010 at 8:13

Tim Down

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2 Comments

Kirzilla Over a year ago

I don't want to have "multidimensial" object. I just want property NAME to be 'object[1][var_name_1]'.

Tim Down Over a year ago

In which case your first code sample will work. I'm not quite clear where the variable bit comes into it now.

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