cnx.js

cnx.js

function cnx(strings, ...keys) {
  const ret = []
  for (let i = 0; i < strings.length + keys.length; i++) {
    if (i % 2 === 0) {
      const index = i / 2
      ret.push(strings[index].trim())
    } else {
      const index = (i - 1) / 2
      const key = keys[index]
      if (typeof key === 'string') {
        ret.push(key)
      }
    }
  }
  return ret.join(' ')
}

const a = null
const b = 'test'

console.log(cnx`hello ${a} world`)
console.log(cnx`hello ${b} world ${a} hi`)