Counting Down Time

basic-countingdown.js

let counting

const SECONDS = 'SECONDS'
const MINUTES = 'MINUTES'

// this function will countdown the given time
// 
// param time (number) 
// param type (MINUTES, SECONDS)
// 
// usage countdown(10, SECONDS) or countdown(1, MINUTES)
function countdown(time, type) {
    let refreshTime

    if (type === MINUTES) {
        refreshTime = parseInt(time) * 60 * 1000
    }

    if (type === SECONDS) {
        refreshTime = parseInt(time) * 1000
    }

    counting = setInterval(() => {
        refreshTime -= 1000

        let seconds = Math.floor((refreshTime / 1000) % 60)
        let minutes = Math.floor((refreshTime / (1000 * 60)) % 60)
        seconds = (seconds < 10) ? "0" + seconds : seconds
        minutes = (minutes < 10) ? "0" + minutes : minutes

        console.log(`counting down : ${minutes}:${seconds}`)
        
        if (seconds === '00') {
            console.log("clear countdown")

            clearInterval(counting)
        }
    }, 1000) // interval running every-second
}

countdown(20, SECONDS)

notify-countingdown.js

let counting

const SECONDS = 'SECONDS'
const MINUTES = 'MINUTE'
const SHOULD_NOTIFY = ['00:27', '00:20', '00:10']

// this function will countdown the given time
// 
// param time in number 
// param type (MINUTES, SECONDS)
// 
// usage countdown(10, SECONDS) or countdown(60, MINUTES)
function countdown(time, type) {
    let refreshTime

    if (type === MINUTES) {
        refreshTime = parseInt(time) * 60 * 1000
    }

    if (type === SECONDS) {
        refreshTime = parseInt(time) * 1000
    }

    counting = setInterval(() => {
        refreshTime -= 1000

        let seconds = Math.floor((refreshTime / 1000) % 60)
        let minutes = Math.floor((refreshTime / (1000 * 60)) % 60)
        seconds = (seconds < 10) ? "0" + seconds : seconds
        minutes = (minutes < 10) ? "0" + minutes : minutes
        concatenate  = `${minutes}:${seconds}`

        notify(concatenate)

        console.log(`counting down : ${concatenate}`)
        
        if (seconds === '00') {
            console.log("clear countdown")

            clearInterval(counting)
        }
    }, 1000) // interval running every-second
}

function notify(currentTime) {
    if (SHOULD_NOTIFY.includes(currentTime)) {
        console.log(`Please notify at: ${currentTime}`)
    }
}

countdown(30, SECONDS)