Codecademy export

main.js

const dnaBases = ['A', 'T', 'C', 'G'];

// Returns a random DNA base
const returnRandBase = () => {
  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: specimenNum,
    _dna: dna,
    get specimenNum() { return this._specimenNum; },
    get dna() { return this._dna; },
    set dna(array) { this._dna = array; },
    mutate() {
      const dnaIndex = Math.floor(Math.random() * 15);
      do {
        newDNA = dnaBases[Math.floor(Math.random() * 4)];
      } while (dna[dnaIndex] === newDNA);
      dna[dnaIndex] = newDNA;
      return dna;
    },
    compareDNA(pAequor) {
      let numMatches = 0;
      for (let i = 0; i < 15; i++)
      {
        if (pAequor.dna[i] === dna[i])
          numMatches++
      }
      const percentPerMatch = 1 / 15;
      const matchPercent = numMatches * percentPerMatch;
      console.log(`specimen #${specimenNum} and specimen #${pAequor.specimenNum} have ${(matchPercent * 100).toFixed(2)}% DNA in common`);
    },
    willLikelySurvive() {
      let numMatches = 0;
      for (let i = 0; i < 15; i++)
      {
        if (['C', 'G'].includes(dna[i]))
          numMatches++
      }
      const percentPerMatch = 1 / 15;
      const matchPercent = numMatches * percentPerMatch;
      return matchPercent >= .6;
    }
  }
};

const getPAequorLikelySurviveArray = () => {
  const pAequors = [];
  for (let i = 0; i < 30; i++) {
    let pAequor = pAequorFactory(i + 1, mockUpStrand());
    while (!pAequor.willLikelySurvive())
      pAequor.dna = pAequor.mutate();
    pAequors.push(pAequor);
  }
  return pAequors;
}

const pAequors = getPAequorLikelySurviveArray();