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 strand 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,
    mutate(){
      const i = Math.floor(Math.random() * 15);
      let tBase = dna[i];
      while (this.dna[i] === tBase) {tBase = returnRandBase()};
      this.dna[i] = tBase;
      return dna;
    },
    compareDNA(pAequorObj){
      let count = 0;
      for (let i = 0; i < this.dna.length; i++){
        if (this.dna[i] === pAequorObj.dna[i]){count++};
      }
      const percent = (count / 15) * 100;
      console.log(`Specimen ${this.specimenNum} and specimen ${pAequorObj.specimenNum} have ${percent} % DNA in common.`);
    },
    willLikelySurvive(){
      let countC = 0, countG = 0;
      const dnaLen = this.dna.length;
      for (let i = 0; i < dnaLen; i++){
        if (this.dna[i] === 'C'){
          countC++;
        } else if (this.dna[i] === 'G'){
          countG++;
        };
      };
      return ((countC / dnaLen) >= 0.6) || ((countG / dnaLen) >= 0.6);
    }
  }
}

function create30pAequorObjects(){
  let arrayOf30pAequor = [];
  let count30 = 0;
  testPAequor = {};
  while (count30 < 30){
    testPAequor = pAequorFactory(count30, mockUpStrand());
    if (testPAequor.willLikelySurvive()){
      arrayOfPAequor.push(testPAequor);
      count30++;
    };
  };
  return arrayOf30pAequor;
}