[Day18] Tally String Times with Reduce

需要用到的技巧與練習目標

1. Array.form
2. map
3. split
4. parseFloat
5. reduce
6. Math.floor
7. %

const timeNodes = Array.from(document.querySelectorAll('[data-time]'))

const seconds = timeNodes
.map(node => node.dataset.time)
.map(timeCode =>{
    const [time, sec] = timeCode.split(':').map(parseFloat);
    return (min * 60) + secs;
})
.reduce((total.vidSecond) => total + vidSeconds);

let secondsLeft = seconds;
const hours = Math.floor(secondsLeft / 3600);
secondsLeft = secondsLeft % 3600;

const mins = Math.floor(secondLeft / 60);
secondsLeft = secondsLeft % 60;

console.log( hours, mins, secondLeft);