Codecademy export

main.js

// Returns a random DNA base
const returnRandBase = () => {
  const dnaBases = ['A', 'T', 'C', 'G']
  return dnaBases[Math.floor(Math.random() * 4)] 
};
//console.log(returnRandBase());

// Returns a random single stand of DNA containing 15 bases
const mockUpStrand = () => {
  const newStrand = []
  for (let i = 0; i < 15; i++) {
    newStrand.push(returnRandBase())
  }
  return newStrand
}
//console.log(mockUpStrand());
const pAequorFactory = (number, dnaArr) => {
  return {
    specimenNum: number,
    dna: dnaArr,
    mutate () {
      let dnaCopy = this.dna;
      let newDna = [];
      const randomIndex = Math.floor(Math.random()*this.dna.length);

      do {
      returnRandBase();  
      dnaCopy.splice(randomIndex, 1,returnRandBase());
      } while (returnRandBase() === dnaCopy[randomIndex]);

     newDna = dnaCopy;
     return newDna;
    },
  }
};

let creature = pAequorFactory(2, mockUpStrand());
console.log(creature.dna)
console.log(creature.mutate());