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 = (num, array) => {
  return {
    specimenNum: num,
    dna: array,
    mutate() {
      let randomNum = Math.floor(Math.random() * this.dna.length - 1);
      let originalVal = this.dna[randomNum];
      let newValue = returnRandBase();
      for (let i = 0; newValue !== originalVal; i++) {
        newValue = returnRandBase();
      };
      this.dna[randomValue] = newValue; 
      return this.dna;
    },
    compareDNA (pAequor) {
      let arr1 = this.dna;
      let arr2 = pAequor.dna;
      let comparedArr = [];
      for (let i = 0; i < arr1.length; i++) {
        if (arr1[i] === arr2[i]) {
          comparedArr.push(arr1[i]);
          }
      };
      let percentage = Math.floor((100 * comparedArr.length) / arr1.length);
      console.log(`specimen #${this.specimenNum} and specimen #${pAequor.specimenNum} have ${percentage}% DNA in common`);
    },
    willLikelySurvive () {
      let csAndGs = [];
      for (let i = 0; i < this.dna.length; i++) {
        if (this.dna[i] === 'C' || this.dna[i] === 'G') {
          csAndGs.push(this.dna[i]);
        }
      };
      let survivePercentage = (100 * csAndGs.length) / this.dna.length;
      if (survivePercentage >= 60) {
        return true;
      } else {
        return false;
      }
    },
    
  }
};

const generator = (array) => {
  for (let i = 1; i <= 30; i++) {
    array.push(pAequorFactory(i, mockUpStrand()));
  }
};

const thirtyInstances = [];

generator(thirtyInstances);


console.log(thirtyInstances[26]);
console.log(thirtyInstances[26].willLikelySurvive());