case.js

const strToEval = '/hello'


const eval = (arg) => {

switch(arg.charAt(0)) {
  case '\'':
    // handle single quote
    break;
  case ' ':
    // handle space
    break:
    default: 
    // throw an error or assume thats its double quote
    break;
}
}

typeof.js

const program = () => {
  router()
}

const router = (user) => {
if(typeof user !== String) {
    handler(user);
} else {
  user.each(x => {
     handler(x);
  })
}
}

const handler = (..args) {
// Do stuff!
}