es6-int-classes-initial-code

es6-int-classes-initial-code.js

'use strict';  
const  Felidea = function() {  
  const bigCats = ['tiger','lion','jaguar', 'leopard', 'snow leopard'];
  const midSize = ['clouded leopard', 'sunda clouded leopard'];
  let species = Object.freeze([...bigCats, ...midSize]);
  return species;
}

const Panthera = function(kind, name, options) {  
  // check if the kind belong to the species list
  if (!kind || !Felidea().includes(kind.toLowerCase())) {
  let message = `The specified species: ${kind} does not belong to the family of Felidae.`;
    throw new Error(message);
  }
  this.kind = kind;
  this.name = name || 'Kitty Doe';
  this.options = options || {};
}