Codecademy export

main.js

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

// 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
}
const pAequorFactory = (specimenNum, dna) => {
  return {
    specimenNum,
    dna,
    mutate() {
      let newBase = returnRandBase();
      let pickRandom = Math.floor(Math.random() * 15);
      do{
        newBase = returnRandBase();
      }while(newBase === this.dna[pickRandom]);
      this.dna[pickRandom] = newBase;
      return this.dna
    },
    compareDNA(pAequor){
      let isSame = 0;
      for(let i = 0; i < pAequor.length; i++){
        if(this.dna[i] === pAequor[i]){
          isSame++;
        }
      }
        isSame/=15;
        isSame*=100; 
      console.log(`The two strands are ${Number.parseFloat(isSame).toFixed(2)}% the same.`)
    },
    willLikelySurvive() {
      let count = 0;
      let somedna = this.dna;
      for(let i = 0; i < somedna.length; i++){
        if(somedna[i] === 'C' || somedna[i] === 'G'){
          count+=1;
        }
      }
      count /=15;
      count*=100;
      return count >= 60 ? true : false
    }
  }
}

let pAequor = [];
let newTestStrand

console.log(pAequor);

const spec34 = pAequorFactory(66, mockUpStrand());
console.log(spec34.dna);
console.log(spec34.mutate());
console.log(spec34.compareDNA(mockUpStrand()));
console.log(spec34.willLikelySurvive());