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=(number,dna)=>{
  return {
    specimenNum : number,
    dna:dna,
    //The mutation function:
    mutate(){
      let randPosition=[Math.floor(Math.random() * 15)];
      let RandDNA=returnRandBase();
      while(this.dna[randPosition]==RandDNA){
          RandDN=returnRandBase();
      }
      console.log('The strand from position: '+ rando +' is '+ this.dna[rando]+' and has been replaced by '+ RandDNA);
      this.dna[rando]=RandDNA;
    },
    //The comparison: checks to see how many items are identical both in the same position
  compareDNA(pAequor){
     let ret = 0;
     this.dna.forEach((strand,i) =>{ 
       if(strand === pAequor.dna[i]) 
          ret++;
          });
     ret = Math.floor((ret / this.dna.length) * 100);
     console.log(`specimen ${this.specimenNum} and specimen  ${pAequor.specimenNum} have ${ret}% DNA in common`)

    },
    // Checks to see how many times C or G appear in the array 
    willLikelySurvive(){
        let CorG=[0,0];
        this.dna.forEach(x=>{
          if(x=='C') 
            CorG[0]++; 
            else if(x=='G') 
            CorG[1]++; 
        });
        if(CorG[0] >=9 || CorG[1] >=9)
          return true;
        return false;
    },

    // replaces every occurence of 'A' with 'T', 'T' with 'A', 'C' with 'G' and 'G' with 'C'
    complementStrand(){
        return this.dna.map(x=>{
          if(x=='A')
            return 'T';
          if(x=='T')
            return 'A';
          if(x=='C')
            return 'G';
          if(x=='G')
            return 'C';
          return x;
        });
    }
  }
}

// Creates an array of arrays with only DNA that can survive 
function canSurvive (pAequor){
    let i=0;
    while(i< pAequor.length){
      let temp= pAequorFactory(i,mockUpStrand());
      if(temp.willLikelySurvive()){
        pAequor[i]=temp;
        i++;
      }
    };
    return pAequor;
};


//let SomeStrand=pAequorFactory(1,mockUpStrand());
//console.log(SomeStrand.dna);
//console.log(SomeStrand.willLikelySurvive());


const request =canSurvive(new Array(30));
// Show all the DNA :
request.forEach(x=> console.log(`specimen ${x.specimenNum} is: ${x.dna} and has a ${x.willLikelySurvive()} chance of survival.`));