Extending String and Array Prototypes - Render To Document - ES6

main.js

String.prototype.renderize = function (type, className, idName) {
    return typeof type != 'undefined' ? 
      `<${type}${ typeof className != 'undefined' ? ' class=\'' + className + '\'' : '' }${typeof idName != 'undefined' ? ' id=\'' + idName + '\'' : ''}> ${this} </${type}>` 
      : new Error ('Unspecified HTML DOM element type (1st argument)')
}

String.prototype.render = function (type, className, idName) {
  document.write(this.renderize(type,className,idName))  
}

Array.prototype.render = function (type, className, idName) {
  this.map( x => {
    document.write(x.renderize(type, className, idName))
  })
}

let text = ["This is the first sentence." ,"And this is another one."]
text.render('h2')