A simple JavaScript template literal function that echos the string, populating all interpolated values.

echo-template-literal.js

/**
 * Usage:
 * const name = 'World'
 * const place = '2018'
 * console.log(echo`Hello, ${name}. Welcome to ${place}.`)
 */
function echo (literals, ...values) {
  return literals.length > 1
    ? values.reduce((accum, value, idx) => accum + value + literals[idx + 1], literals[0])
    : literals[0]
}