Javascript equivalent of Python's iterkeys() dictionary method

Question

In Python I can use the iterkeys() method to iterate over the keys of a dictionary. For example:

mydict = {'a': [3,5,6,43,3,6,3,],
          'b': [87,65,3,45,7,8],
          'c': [34,57,8,9,9,2],}
for k in mydict.iterkeys():
    print k

gives me:

a
c
b

How can I do something similar in Javascript?

Answer 1

var mydict = {
  'a': [3,5,6,43,3,6,3,],
  'b': [87,65,3,45,7,8],
  'c': [34,57,8,9,9,2],
};
for (var key in mydict) {
  alert(key);
}

Answer 2

for(k in mydict){
   alert(k)
}