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(){
      const randIndex = Math.floor(Math.random()*this.dna.length);
      let newBase = returnRandBase();
      while (this.dna[randIndex]===newBase){
        newBase=returnRandBase();
      }
      this.dna[randIndex] = newBase;
      return this.dna;
    },
    compareDNA(otherOrg) {
      const similarities = this.dna.reduce((acc, curr, idx, arr) => {
        if (arr[idx] === otherOrg.dna[idx]) {
          return acc + 1;
        } else {
          return acc;
        }
      }, 0);
    const percentOfDNAEqual= (common/this.dna.length)*100;
  const percentTo2Deci = percentOfDNAEqual.toFixed(2);
  console.log(`${this.specimenNum} and ${PAequor.specimenNum} have ${percentageTo2Deci}% DNA in common.`);
    },
    willLikelySurvive () {
      const chances = this.dna.filter (el => el === 'C' || el === "G");
      return chances.length/this.dna.length >=0.6;
    } ,  
    
  }
};

const survivingSpecimen = [];
let idCounter = 1;
while (survivingSpecimen.length < 30){
  let newOrg = pAequorFactory(idCounter, mockUpStrand());
  if (newOrg.willLikelySurvive()){
    survivingSpecimen.push(newOrg);
  }
  idCounter++;
}
console.log(survivingSpecimen)