Get json object values and store as arrays

Question

[
    ['david','female','john','e6a33eee180b07e563d74fee8c2c66b8',1,1,'roger63'],
    ['rogers','Male','paul','2e7dc6b8a1598f4f75c3eaa47958ee2f',1,2,'mike28']
]

I tried using

$.map(a, function(value, index) {
    return [value];
});

but the result i got is the same as the image like nothing happened.

can anyone help me? I would really appreciate it.