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;
};

//factory function (make new specimen)
function pAequorFactory(number, array) {
  let object = {
    specimenNum: number, 
    dna: array,

    complementStrand() {
      let complementaryStrand = [];
      this.dna.forEach(function(base) {
        if (base === 'A') {
          complementaryStrand.push('T'); 
        } else if (base === 'T') {
          complementaryStrand.push('A'); 
        } else if (base === 'C') {
          complementaryStrand.push('G'); 
        } else if (base === 'G') {
          complementaryStrand.push('C'); 
        }
      })
      return complementaryStrand;
    },

    mutate() {
      let baseToMutate = Math.floor(Math.random() * 15);
      let originalBase = this.dna[baseToMutate];
      function mutation() {
        const dnaBases = ['A', 'T', 'C', 'G'];
        dnaBases.splice((dnaBases.indexOf(originalBase)), 1);
        return dnaBases[Math.floor(Math.random() * 3)];
      }
      let mutatedBase = mutation();
      this.dna[baseToMutate] = mutatedBase;
      return this.dna;
    },

    compareDNA(pAequor) {
      let counter = 0;
      for (let i = 0; i < this.dna.length; i++) {
        if (this.dna[i] === pAequor.dna[i]) {
          counter++;
        }
      }
      let percentage = (counter/this.dna.length) * 100;
      // console.log(`Specimen #${this.specimenNum} and Specimen #${pAequor.specimenNum} have ${percentage}% DNA in common.`);
      return percentage;
    },

    willLikelySurvive() {
      let counter = 0;
      this.dna.forEach(function(element) {
        if (element === 'C' || element === 'G') {
          counter++;
        }
      })
      let percentage = counter/this.dna.length * 100;
      // console.log(`Specimen #${this.specimenNum} has ${percentage}% of 'C' or 'G' in DNA. It's better likelyhood to survive is:`);
      return percentage >= 60;
    }    
    
  };
  return object;
};

//make a random population that is likely to survive
function makePAequorPopulation(populationNumber) {
  let array = [];
  for (i = 1; i < populationNumber+1; i++) {
    let individual = pAequorFactory(i, mockUpStrand());
    if (individual.willLikelySurvive() === true) {
      array.push(individual);
    } else {
      i--;
    }
  }
  return array;
}

//find two most related specimens
function mostRelated(array) {
  let strongestRelations = [];
  let mostRelated = 0;
  for (let i = 0; i < array.length; i++) {
    for (let j = i + 1; j < array.length; j++) {
      let comparison = array[i].compareDNA(array[j]);
      if (comparison > mostRelated) {
        mostRelated = comparison;
        strongestRelations = [(array[i].specimenNum), (array[j].specimenNum)];
      } else if (comparison === mostRelated) {
        strongestRelations.push((array[i].specimenNum), (array[j].specimenNum));
      }
    }
  }
  console.log(`The most related specimens have ${mostRelated}% DNA in common`);
  console.log('These are the most related specimens:')
  return strongestRelations;
}


let population = makePAequorPopulation(30);
// console.log(population);
console.log(population[1].dna) 
console.log(population[1].complementStrand());
console.log(mostRelated(population));