Set an object property by using its value [duplicate]

Question

Say I call following function:

var query = makeQuery("email", "[email protected]");

The implementation I have is:

makeQuery = function (key, value) { return { key: value}; }

The object I end up with is: {"key": "[email protected]"}, which is obviously wrong. I would like to obtain {"email": "[email protected]"} instead. I tried setting it like so:

makeQuery = function (key, value) { return { JSON.stringify(key): value}; }

... but I get a "SyntaxError: Unexpected token ." I've also thought of using toString() and even eval(), without success. So my problem is to be able to set the property of the object returned in makeQuery() using its real value, that is, pick up the value of 'key', not setting the property with the 'key' literal.

Thanks for the help.

myDOMElement.setAttribute("attName","attValue"); might help also — Dragan Okanovic
– Dragan Okanovic, Commented Jul 7, 2013 at 17:36

James Allardice · Accepted Answer · 2013-07-07 17:35:39Z

4

Create the object first and then use the square bracket syntax so you can set the property using the value of key:

makeQuery = function (key, value) { var query = {}; query[key] = value; return query; };

answered Jul 7, 2013 at 17:35

James Allardice

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1 Comment

titusmagnus Over a year ago

This one gets my vote because the function reads better. The other solutions work as well. Thanks for the help!

Schleis · Accepted Answer · 2013-07-07 17:36:06Z

For variable keys in objects, use

var obj[key] = value

So then it becomes:

function makeQuery(key, value) { var obj = {}; obj[key] = value; return obj; }

cocco · Accepted Answer · 2013-07-07 17:36:31Z

define an object..

makeQuery = function (key, value) { var o = {}; o[key] = value; return o; }

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