returning callbacks early

return.js

function someAsyncFn (cb) {
  if (somethingWrong) {
    cb(err)  
  } else {
    cb(null, 'yay')
  }
  
  ...
  
  // potentially some things happen here
}

function careful (cb) {
  if (somethingWrong) {
    return cb(err)  
  } else {
    return cb(null, 'yay')
  }
  
  ...
  // stuff down here does not happen
}