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;
};

function getRandNum(min, max) {
  return Math.floor(Math.random() * max) + min;
}

function pAequorFactory(specimenNum, dna) {
  return {
    specimenNum,
    dna,
    mutate() {
      const randNum = getRandNum(0, 14);
      const randBase = this.dna[randNum];
      let mutatedBase = null;
      while (mutatedBase !== randBase) {
        mutatedBase = returnRandBase();
      }
      this.dna[getRandNum(0, 14)] = mutatedBase;
      return this.dna;
    },
    compareDNA(pAequor) {
      const dnaInCommon = this.dna.filter(
        (base, idx) => pAequor.dna[idx] === base
      );
      console.log(
        `specimen #${this.specimenNum} and specimen #${
          pAequor.specimenNum
        } have ${dnaInCommon.length / this.dna.length} DNA in common`
      );
    },
    willLikelySurvive() {
      const percentage = this.dna.reduce((acc, currVal) => {
        if (currVal === "C" || currVal === "G") {
          return acc + 1 / this.dna.length;
        }

        return acc;
      }, 0);

      if (percentage < 0.6) {
        return false;
      }

      return true;
    },
  };
}

const species01 = pAequorFactory(1, mockUpStrand());
console.log("dna of species01 before mutation: ", species01.dna);
species01.mutate();
console.log("dna of species01 after mutation:  ", species01.dna);

const species02 = pAequorFactory(2, mockUpStrand());
species01.compareDNA(species02);

console.log(species01.willLikelySurvive());

function createSpecimen(specimenLength, startNum) {
  const survivableSpecimen = [];
  let loopNum = specimenLength + startNum;
  let i = startNum;
  while (i < loopNum) {
    let canSurvive = false;
    while (!canSurvive) {
      let specimen = pAequorFactory(i, mockUpStrand());
      if (specimen.willLikelySurvive()) {
        canSurvive = true;
        survivableSpecimen.push(specimen);
      }
    }
    i++;
  }

  return survivableSpecimen;
}

const specimenArr = createSpecimen(30, 3);
console.log(specimenArr);