SOURCE

function Group(arr = [], key){
    return key ? arr.reduce((t, v) => (!t[v[key]] && (t[v[key]] = []),t[v[key]].push(v), t),{}): {};
}


const arr = [
    { area: "GZ", name: "YZW", age: 27 },
    { area: "GZ", name: "TYJ", age: 25 },
    { area: "SZ", name: "AAA", age: 23 },
    { area: "FS", name: "BBB", age: 21 },
    { area: "SZ", name: "CCC", age: 19 }
]; // 以地区area作为分组依据
console.log(Group(arr, "area")); 


function Keyword(arr = [], keys = []){
    return keys.reduce((t, v) => (arr.some(w => w.includes(v)) && t.push(v), t), []);
}
const text = [
    "今天天气真好，我想出去钓鱼",
    "我一边看电视，一边写作业",
    "小明喜欢同桌的小红，又喜欢后桌的小君，真TM花心",
    "最近上班喜欢摸鱼的人实在太多了，代码不好好写，在想入非非"
];
const keyword = ["偷懒", "喜欢", "睡觉", "摸鱼", "真好", "一边", "明天"];

console.log(Keyword(text, keyword));