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 pAequorFactory(specimenNum,dna){
  return {
    specimenNum,
    dna,
    mutate(){
      const index = Math.floor(Math.random()*15);
      let next = returnRandBase();

      while(this.dna[index] == next){
        next = returnRandBase();
      }
      this.dna[index] = next;

      return this.dna;
    },
    compareDNA(pAequor){
      let sameCount = 0;

      this.dna.forEach((v,i)=>{
        if(v == pAequor.dna[i]) ++sameCount;
      });

      const rate = sameCount / this.dna.length * 100;
      console.log(`specimen #${this.specimenNum} and specimen #${pAequor.specimenNum} have ${rate}% DNA in common`);
    },
    willLikelySurvive(){
      const surviveLen = this.dna.filter(i=>/[C,G]/.test(i)).length;
      return surviveLen / this.dna.length >= 0.6;
    },
    complementStrand(){
      return this.dna.map(i=>{
        if(i == 'A') return 'T';
        if(i == 'T') return 'A';
        if(i == 'C') return 'G';
        if(i == 'G') return 'C';
      });
    },
  };
}
// const a=pAequorFactory(1,mockUpStrand());
// const b=pAequorFactory(2,mockUpStrand());
// console.log(a.dna);
// console.log(b.dna);
// a.compareDNA(b);
// console.log(a.willLikelySurvive());

const pAequors = [];
let p;

while(pAequors.length < 30){
  p = pAequorFactory(pAequors.length + 1,mockUpStrand());
  if(p.willLikelySurvive()){
    pAequors.push(p);
  }
}
// console.log(pAequors);

const c=pAequorFactory(2,mockUpStrand());
// console.log(c.dna);
// console.log(c.complementStrand());