Getting JavaScript object key list

Question

I have a JavaScript object like

var obj = {
   key1: \'value1\',
   key2: \'value2\',
   key3: \'value3\',
   key4: \'value4\'
}

How can I

Answer 1

Underscore.js makes the transformation pretty clean:

var keys = _.map(x, function(v, k) { return k; });

Edit: I missed that you can do this too:

var keys = _.keys(x);