explain why we use a callback in getWordScanner returned function
explain why we use a callback in getWordScanner returned function

neilk/letterpwn,hotrannam/letterpwn,hotrannam/letterpwn,hotrannam/letterpwn,neilk/letterpwn,neilk/letterpwn,neilk/letterpwn,hotrannam/letterpwn