Bob, he went to the store

I was taught to say "Bob went to the store", and never say "Bob, he went to the store." I have been hearing the latter construction a lot lately. Is it okay, now?

Solution 1:

• Bob, he went to the store.

is an example of the syntactic construction called Left Dislocation,
derived from an original sentence

• Bob went to the store.

There is also Right Dislocation, as in

• He went to the store, Bob.

from the same source.

Dislocations like these are common devices for emphasizing certain words and de-emphasizing others, using the beginning and ending of a sentence as spotlights, depending on stress and intonation in context. They're perfectly good grammatical spoken English, but not so common in writing, except for reporting dialog.