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 = (pAequorNumber, bases) =>  {
  let pAequor = {
    specimenNum: pAequorNumber,
    dna: bases,
    mutate() {
      const randBase = Math.floor(Math.random() * 15);
      const currentBase = this.dna[randBase];
      let newBase = '';
      const dnaBases = ['A', 'T', 'C', 'G'];
      do {
        newBase = dnaBases[Math.floor(Math.random() * 4)];
      } while(newBase === currentBase);
      this.dna[randBase] = newBase;
    },
    compareDNA(pAequor) {
      let commonCount = 0;
      for (let i = 0; i < this.dna.length; i++) {
        if (this.dna[i] === pAequor.dna[i]) {
          commonCount++;
        }
      }
      console.log(`specimen #${this.specimenNum} and specimen #${pAequor.specimenNum} have ${Math.floor(commonCount/this.dna.length*100)}% DNA in common`);
    },
    willLikelySurvive() {
      let survivalCount = 0;
      const survivalBar = 0.6;
      for (let i = 0; i < this.dna.length; i++) {
        if (this.dna[i] === 'C' || this.dna[i] === 'G') {
          survivalCount++;
        }
      }
      return survivalCount/this.dna.length >= survivalBar;
    },
    complementStrand() {
      let complements = {
        A: 'T',
        T: 'A',
        C: 'G',
        G: 'C'
      }
      let complementStrand = [];
      for (let base of this.dna) {
        complementStrand.push(complements[base]);
      }
      return complementStrand;
    }
  };
  return pAequor;
}

const create30InstancesOfPAequor = () => {
  let pAequorArray = []; 
  for (let i = 0; i < 30; i++) {
    pAequorArray.push(pAequorFactory(i, mockUpStrand()));
  } 
  return pAequorArray;
}

let pAequorArr = create30InstancesOfPAequor();
for(let i = 0; i < pAequorArr.length; i++) {
  for(let j = 0; j < pAequorArr.length; j++) {
    pAequorArr[i].compareDNA(pAequorArr[j]);
  }
}

// #6, #12 have 73% commonality.

let pAequor0 = pAequorFactory(0, mockUpStrand());
console.log(pAequor0.dna);
console.log(pAequor0.complementStrand());