tagged-string.js

function urlEncodedTaggedString(strings, ...substitutions) {
  let result = strings[0]
  for (let i = 0; i < substitutions.length; ++i) {
    result += encodeURIComponent(substitutions[i])
    result += strings[i + 1]
  }
  return result
}

let name = 'I have ? and #!'
let url = urlEncodedTaggedString`/person/${name}`