javascript - 合并两个具有相同键的对象并将值转换为数组

Question

var obj1 = {name: “John”, hobby: “Football”}

var obj2 = {hobby: “Basketball”}

这是我的两个对象。我想合并它们，我的结果将是

   var obj1 = {name: “John”, hobby :[“Foootbal”,”Basketball”]}

我怎样才能做到这一点？

Answer 1

var obj1 = {name: "John", hobby: "Football"}

var obj2 = {hobby: "Basketball"}
var obj3 = {hobby: "Tennis"}

const merge = (obj1, obj2) => {
    Object.keys(obj1).forEach(key => { if (obj2[key]) obj1[key] = [...[obj1[key]], obj2[key]].flat() })
}

merge(obj1, obj2)
merge(obj1, obj3)

console.log(obj1)