Type preservation in ES6 String Interpolation/Template Literlars

ES6LiteralWithType.js

/*
 * Preservation of implicit type in interpolated string (ES2015)
 * 
 * Authors:
 * - Nik Kyriakides, @nicholaswmin, nik.kyriakides@gmail.com
 *
 * MIT Licensed
 */

const aNum = 3;
const aStr = "3";

const typeDeterminant = function(val) {
  switch (typeof val) {
    case "string":
      return `'${val}'`;
      break;
    case "number":
      return val;
      break;
    default:
      return val;
  }
}

const interpolated = `Your value: ${typeDeterminant(aStr)}`

// prints "Your value: '3'" instead of "Your value: 3" thus implicitly preserving the type
console.log(interpolated)