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

obj = {'a':'c','b':'d'}

You can try:

[index for (index in obj)] 

this will return:

['a','b']

to get the list of keys or

[obj[index] for (index in obj)]

to get the values