employeeLeavesReader.js

const fs = require('fs');
const util = require('util');

const readFile = util.promisify(fs.readFile);

async function getFileLines() {
    try {
        const args = process.argv.slice(2)
        if (!args.length) {
            console.warn('>> Please pass file name as argument <<')
            return
        }
        const fileName = args[0]
        const fileContent = await readFile(`${fileName}`, 'utf-8');
        const lines = fileContent.split(/\r?\n/)
        return lines
    } catch (error) {
        console.log(error)
    }

}

async function main() {
    let emplyeesLeaveCounts = {}
    const publicHolidays = ['20180321']

    const fileLines = await getFileLines()
    fileLines.forEach(line => {
        let row = line.split(' ');
        row = row.filter(item => !!item);
        const emplyeeName = row[0];

        if (Object.keys(emplyeesLeaveCounts).indexOf(emplyeeName) === -1) {
            emplyeesLeaveCounts[emplyeeName] = 0
        }

        const dates = row.slice(1)
        dates.forEach((date) => {
            const isPublicHoliday = publicHolidays.indexOf(date) > -1;
            !isPublicHoliday && (emplyeesLeaveCounts[emplyeeName] += 1)
        })

    })

    if (Object.keys(emplyeesLeaveCounts).length) {
        const sortedObject = Object.keys(emplyeesLeaveCounts).sort().reduce((acc, item) => {
            const eKey = item
            const eValue = emplyeesLeaveCounts[item]
            acc[eKey] = eValue
            return acc
        }, {})
        console.log(sortedObject)
        return sortedObject
    }
}


main()