how to delete an object with an object key from a map object?

Question

for example if i created a map object called members

const members = new Map();

here's the normal way for adding a new object inside members

//members.set(key, value);
members.set('Evelyn',{name: 'Evelyn', age: 25});
//here's how can we delete this object 
members.delete('Evelyn');

but when i started reading about map objects in es6 i was confused that the keys can be an object too!!

Map is an object that lets you store key-value pairs where both the keys and the values can be objects

if so how can i delete the one with the object key ?

//key as an object
members.set({id: 1}, {
 name: 'Evelyn',
 age: 30
});

I guess you need to keep a reference. const myKey = { id: 1 };. Now use myKey as first param to set and delete. — user5734311
– user5734311, Commented Aug 5, 2019 at 20:37
why not take the id as key? do you have a special reason, why it should be an object? — Nina Scholz
– Nina Scholz, Commented Aug 5, 2019 at 20:41
What do you mean, "returns false"? And it works fine for me: jsfiddle.net/khrismuc/vwd0tjqo — user5734311
– user5734311, Commented Aug 5, 2019 at 20:41
@NinaScholz yes I know that I can do so, i just want to understand the concept — Mina Ragaie
– Mina Ragaie, Commented Aug 5, 2019 at 20:45

Nina Scholz · Accepted Answer · 2019-08-05 20:49:10Z

2

You need eiter the same object reference of the key or seach with some infomation of the object.

var members = new Map,
    id = 1,
    key;

members.set({ id: 1 }, { name: 'Evelyn', age: 30 });
console.log([...members]); // one element

for (key of members.keys()) if (key.id === id) members.delete(key);

console.log([...members]); // []

.as-console-wrapper { max-height: 100% !important; top: 0; }

answered Aug 5, 2019 at 20:49

Nina Scholz

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Comments

Will Jenkins · Accepted Answer · 2019-08-05 20:44:23Z

0

let objectKey = {id: 1};
members.set(objectKey, {
 name: 'Evelyn',
 age: 30
});

members.delete(objectKey);

As of my knowledge Maps compare via reference so this would be the only way.

edited Aug 5, 2019 at 20:44

Will Jenkins

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answered Aug 5, 2019 at 20:37

MaximilianMairinger

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1 Comment

Mina Ragaie Over a year ago

i tried this way many times before posting this question and it returned false in chrome console .. that's why i came here.. but it works now, thanks

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