some questions from javascript like-- * what is the difference between let and const? *what is the output of 12+5+"3" ? * What is the output of "1"+2+3 ? and some questions on React ---> * what is the difference between state and prop? * tell me some React hooks? * and told to create React component and given an array of objects that had to be shown on UI. and filter had to be implemented based on Name.