tagged-template-literal.js

function pluralizer(strings, ...values) {
  // `strings` is [ 'I ate ', ' ' ]
  
  let output = []
    suffix = ''
  
  if (values[0] !== 1) {
    suffix = 's'
  }
  
  strings.forEach((string, i) => {
    output.push(string, values[i])
  })
  
  output.push(suffix)
  
  return output.join('')
}

let quantity = 3, noun = 'pizza'
console.log(pluralizer`I ate ${quantity} ${noun}`) // -> "I ate 3 pizzas"

quantity = 1; noun = 'potato'
console.log(pluralizer`I ate ${quantity} ${noun}`) // -> "I ate 1 potato"