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 = (specimenNum, dna) => {
  return ({
    specimenNum: specimenNum,
    dna: dna,
    mutate(){
      const randBase = this.dna(Math.floor(Math.random() * this.dna.length))
      let newBase = returnRandBase()
      while (randBase != newBase){
        newBase = returnRandBase()
      }
      this.dna[i] = newBase
      return this.dna
    },
    compareDNA(pAequorObj){
      let identicalBases = 0
      for (base in pAequorObj.dna){
        if (pAequorObj.dna[base] == this.dna[base]){
          identicalBases++
        }
      }
      const percentEqual = (identicalBases/this.dna.length)*100
      return `specimen ${this.specimenNum} and ${pAequorObj.specimenNum} have ${percentEqual}% DNA in common`
    },
    willLikelySurvive(dnaArray){
      let CGBases = 0
      for (base in dnaArray){
        if (dnaArray[base] == 'C' || dnaArray[base] == 'G'){
          CGBases++
        }
      }
      return (CGBases/dnaArray.length)*100 >= 60
    },
    complementStrand(dnaArray){
      let complement = []
      for (base in dnaArray){
        switch(dna[base]){
          case 'A':
            complement.push('T')
            break;
          case 'T':
            complement.push('A')
            break;
          case 'C':
            complement.push('G')
            break;
          case 'G':
            complement.push('C')
            break;
        }
      }
      return complement
    }
  })
}

// create 30 instances that can survive in their environment
const thirtySamples = () => {
  let pAequorArray = []
  let createRandDNA = []
  while (pAequorArray.length != 30){
    createRandDNA = mockUpStrand() 
    let surviving = pAequorFactory(pAequorArray.length, createRandDNA).willLikelySurvive(createRandDNA)
    if (surviving == true){
      pAequorArray.push(pAequorFactory(pAequorArray.length, createRandDNA))
    }
  }
  return pAequorArray
}