const transportation = data.reduce((obj, item)=>{
        if(!obj[item]){
            obj[item] =0
        }
        obj[item]++ 
    }, {})
- Array.sort()
    const sorted = people.sort( (a, b) => {
        const [aLast, aFirst] = a.split(', ')
        const [bLast, bFirst] = b.split(', ')
        return aLast > bLast ? 1: -1
    })
- Nodelist不是Array 如何轉換
    - Array.from(Nodelist)
    - [... Nodelist]
    - links.map(link=> link.textContent).filter(s -> s.includes('de'))