映射获取对象键返回未定义

Question

in map we can store any kind of data as a key, so why I cannot get the value of key object using get ?

let map = new Map()
map.set('name', 'str')
map.set(1, 'num')
map.set({country: 'Abuddin'}, 'Tyrant')

so now using map.get(key), gets all values except the object

map.get('name')
"str"

map.get(1)
"num"

map.get({country: 'Abuddin'})
undefined

shouldn't map.get({country: 'Abuddin'}) get Tyrant?

Answer 1

You need the same object reference, not a new object.

 let map = new Map(), object = { country: 'Abuddin' }; map.set('name', 'str') map.set(1, 'num') map.set(object, 'Tyrant') console.log(map.get('name')); console.log(map.get(1)); console.log(map.get(object));