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 = (num, arr) => {
  return {
  specimenNum: num,
  dna: arr,
  mutate() {
    randomNo = Math.floor(Math.random()*15);
    let mutatingBase = this.dna[randomNo];
    let newBase;
    do {
      newBase = returnRandBase();
    } while(newBase === mutatingBase)
    if (newBase !== mutatingBase) {
      this.dna.splice(randomNo, 1, newBase);
      }
      return this.dna
    },
    compareDNA(pAequor) {
      let otherDNA = pAequor.dna;
      let thisDNA = this.dna;
      let count = 0;
      let length = thisDNA.length
      for(let i=0; i<thisDNA.length; i++) {
        if(thisDNA[i] === otherDNA[i]) {
          count = count + 1;
        };
      }
      console.log(count);
      console.log(length);
      const similarity = (count/length)*100
      console.log(`The similarity is: ${similarity}%`);
    },
    willLikelySurvive() {
      let count = 0;
      let length = this.dna.length;
      for (let i=0; i<this.dna.length; i++) {
        if(this.dna[i] === 'C' || this.dna[i] === 'G') {
          count++
        }
      }
      let percentage = (count/length)*100;
      if (percentage >= 60) {
        return true;
      } else {
        return false;
      }
    },
  }
};

let thirtySurvivors = [];
let number = 0;
const create30Survivors = () => {
  do {
    number++;
    let newOrganism = pAequorFactory(number, mockUpStrand());
    if (newOrganism.willLikelySurvive) {
      thirtySurvivors.push(newOrganism)
    }
  } while (thirtySurvivors.length < 30)
};

create30Survivors();
console.log(thirtySurvivors);