datadog coding challenge

index.js

const get_tag_counts = function(stream) {
    const unsortedTags = {};
    const sortedTags = [];

    stream.forEach(function(row) {
        const splitRow = row.split('|');
        const tags = splitRow[2] || '';

        const splitTags = tags.split(',');

        splitTags.forEach(function(tag) {
            if(tag === '') {
                return
            }

            if(unsortedTags[tag]) {
                unsortedTags[tag] += 1
            } else {
                unsortedTags[tag] = 1
            }
        });
    });

    Object.keys(unsortedTags).forEach(function(tag) {
        sortedTags.push([tag, unsortedTags[tag]]);
    });

    sortedTags.sort(function(a, b) {
        if(b[1] === a[1]) {
            return b[0] < a[0] ? 1 : -1;
        } else {
            return b[1] - a[1];
        }
    });

    sortedTags.forEach(function(tagCount) {
        console.log(tagCount[1] + ' ' + tagCount[0]);
    });
};

const stream = [
    'system.load.1|1|host:a,role:web,availability-zone:us-east-1a',
    'system.load.15|1|host:b,role:web,availability-zone:us-east-1b',
    'system.cpu.user|20|host:a,role:web,availability-zone:us-east-1a',
    'postgresql.locks|12|host:c,role:db,db_role:master,availability-zone:us-east-1e',
    'postgresql.db.count|2|host:d,role:db,db_role:replica,availability-zone:us-east-1a',
    'kafka.consumer.lag|20000|host:e,role:intake,availability-zone:us-east-1a',
    'kafka.consumer.offset'
];

get_tag_counts(stream);