[Solution] Challenge Project by CodeAcademy on Back-End Engineer Career Path

mysteriousOrganism.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 {
        _dna: dna,
        _specimenNum: specimenNum,
        get dna() {
            return this._dna;
        },
        set dna(newDna) {
            this._dna = newDna;
        },
        get specimenNum() {
            return this._specimenNum;
        },
        set specimenNum(newSpecimenNum) {
            this._specimenNum = newSpecimenNum;
        },
        mutate() {
            const randIndex = Math.floor(Math.random() * this._dna.length);
            this._dna[randIndex] = () => {
                const currentBase = this._dna[randIndex];
                let selectBase = true;
                do {
                    let generatedBase = returnRandBase();
                    if (generatedBase !== currentBase) {
                        selectBase = false;
                        this._dna[randIndex] = generatedBase;
                    }
                } while (selectBase);
                return this._dna[randIndex];
            };
        },
        compareDNA(pAequor) {
            let dnaMatch = 0;
            for (let i = 0; i < this._dna.length; i++) {
                if (this._dna[i] === pAequor.dna[i]) {
                    dnaMatch++;
                }
            }
            console.log(
                `Specimen #${this._specimenNum} and specimen #${pAequor.specimenNum} have ${dnaMatch / this._dna.length}% DNA in common.`
                );
            // return dnaMatch / this._dna.length;
        },
        willLikelySurvive() {
            let baseCount = 0;
            this._dna.forEach((base) => {
                if (base === 'C' || base === 'G') {
                    baseCount++;
                }
            });
            if (baseCount >= 9) {
                return true;
            }
            return false;
        },
        complementStrand() {
            let complementStrandArray = [];
            this._dna.forEach((base) => {
                if (base === 'A') {
                    complementStrandArray.push('T');
                } else if (base === 'T') {
                    complementStrandArray.push('A');
                } else if (base === 'C') {
                    complementStrandArray.push('G');
                } else if (base === 'G') {
                    complementStrandArray.push('C');
                }
            });
            return complementStrandArray;                    
        },
    };
};
let specimenCount = 30;
const pAequorArray = [];
for(let i = 0; i < specimenCount; i++) {
    const newSpecimen = pAequorFactory(i + 1, mockUpStrand());
    console.log(`Specimen #${newSpecimen.specimenNum} has DNA: ${newSpecimen.dna}`);
    if(newSpecimen.willLikelySurvive()) console.log(`Specimen #${newSpecimen.specimenNum} will likely survive.`);
    pAequorArray.push(newSpecimen);
    console.log(`Specimen #${newSpecimen.specimenNum} - Complement strand: ${newSpecimen.complementStrand()}`);
    if (i>0) {
        newSpecimen.compareDNA(pAequorArray[i]);
    }
}