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
}

// Factory Function for pAequor
const pAequorFactory = (number, array) => {
  return {
    specimenNum: number,
    dna: array,
// Simulate Mutation
    mutate() {
      const randIndex = Math.floor(Math.random() * this.dna.length);
      let newBase = returnRandBase();
      while (this.dna[randIndex] === newBase) {
        newBase = returnRandBase();
      }
      this.dna[randIndex] = newBase;
      return this.dna;
    },
// Compare DNA of different pAequor objects
    compareDNA(otherObj) {
      const similarities = this.dna.reduce((acc, curr, idx, arr) => {
        if (arr[idx] === otherObj.dna[idx]) {
          return acc + 1;
        } else {
          return acc;
        }
      }, 0);
      const percentageOfDNAShared = (similarities / this.dna.length) * 100;
      const percentageToDeci = percentageOfDNAShared.toFixed(2);
      console.log(`${this.specimenNum} and ${otherObj.specimenNum} have ${percentageTo2Deci}% DNA in common.`);
    },
// Chances of Survival
    willLikelySurvive() {
      let sum = 0;
      for (let i = 0; i < this.dna.length; i++) {
        if (this.dna[i] === "C" || this.dna[i] === "G") {
          sum += 1;
        };
      }
      let percentage = (sum / this.dna.length) * 100;
      if (percentage >= 60) {
        return true
      } else {
        return false
      };
    },
   }
 };

 const survivingSpec = [];
 let idCounter = 1;

 while (survivingSpec.length < 30) {
   let newOrg = pAequorFactory(idCounter, mockUpStrand());
   if (newOrg.willLikelySurvive()) {
     survivingSpec.push(newOrg);
   }
   idCounter++;
 }

 console.log(survivingSpec)