Do Javascript objects allow keys that contain spaces?

Question

My Data: I have a an Array of Objects:

var totalsArray = [
  { Applications: 1, Computing Servers: 0, Contracts: 0, Country: "United States" },
  { Applications: 1, Computing Servers: 0, Contracts: 0, Country: "Italy" },
  { Applications: 1, Computing Servers: 0, Contracts: 0, Country: "United States" },
  { Applications: 1, Computing Servers: 0, Contracts: 0, Country: "Spain" }
];

My Code: I then try to extract the keys using the following code:

var objectKeys = d3.keys(totalsArray[0]).filter(function(key) { return key;} );

However, I get an error because of the space in the key named "Computing Servers".

My question: Is there a way to properly create and keep the "space" in the key name/string?

Thank you for any assistance you can offer.

IIRC: you will also need to put quotes around the property names as you are initializing the object. — Ryan Ransford
– Ryan Ransford, Commented Jan 13, 2014 at 21:44

user2864740 · Accepted Answer · 2014-01-13 21:52:30Z

10

Yes, a propery name can be any string (all values are coerced to strings before they are used internally).

This can be done using quotes (double or single) around names in literals:

{ Applications: 1, "Computing Servers": 0, .. },

Just as it can be done with using the obj[prop] syntax (where prop is any expression that can be converted to a sensible string value):

obj["Computing Servers"] = 42;

edited Jan 13, 2014 at 21:52

answered Jan 13, 2014 at 21:44

user2864740

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1 Comment

hugomg Over a year ago

This technique is also useful for reserved keywords like "if" or "function" or "continue".

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