03.DNAEx

function calcGenes(input) {
    let pattern = /([a-z!@#$?]+)=([\d]+)--([\d]+)<<([a-z]+)/g;
    let organismos = new Map();
    let exec;
    for (let line of input) {
        while(exec = pattern.exec(line)) {
           let geneName = exec[1].replace(/[!@#$?]/g, '');
           let nameLength = exec[2];
           let countOfGenes = exec[3];
           let organism = exec[4];
           if(geneName && nameLength && countOfGenes && organism && geneName.length === +nameLength) {
                if(!organismos.has(organism)) {
                    organismos.set(organism, 0)
                }
                let sum = organismos.get(organism)
                organismos.set(organism, sum + +countOfGenes)
           }
        }
    }
    let result = [];
    let sortedOrganismos = Array.from(organismos.keys())
    .sort((k1, k2) => {
        return organismos.get(k2) - organismos.get(k1);
    })

    for (let key of sortedOrganismos) {
        result.push(`${key} has genome size of ${organismos.get(key)}`);
    }
    return result.join('\n');