In one of my earlier JS projects, the coding guidelines strictly enforced the rule of declaring all variables at top of the function to not get confused by JS h

In one of my earlier JS projects, the coding guidelines strictly enforced the rule of declaring all variables at top of the function to not get confused by JS hoisting "magic". You need to enforce coding conventions in JS as soon as you have greater than one person working on a project. Sometimes even if you are the lone person - esp if you are coming back to it after a delay.