How to access values of keys that are objects in js Map

Question

I am trying to store values in a JavaScript Map using an object as a key. However I am unable to access them using the get method provided by Map object. This is what I am trying to do -

let map1 = new Map();
map1.set({a: 1}, "valueforobject");
console.log(map1.get({a: 1})); //expected this to print valueforobject but got undefined

When I am logging the map itself however I can the that the value has been stored safely. How do I access this using the get method or any other way appropriate here?

knowing the following may help ... {a: 1} !== {a: 1} ... but var a = {a: 1}; a === a; — Bravo
– Bravo, Commented Jul 23, 2021 at 5:37
Bravo thank you got what you wrote, in that case how can I store value using an object key in a Map and safely access it later. Or should I not be using it at all in which case what are my alternatives? — NUMBART
– NUMBART, Commented Jul 23, 2021 at 5:40
Oh, I thought that would be obvious if you understood why that comment was relevant ... here it is in a way that's 100% relevant to your code - var a= {a:1}; map1.set(a, "valueforobject");console.log(map1.get(a)); — Bravo
– Bravo, Commented Jul 23, 2021 at 5:43
I will actually be constructing the object based on the use case, to fetch the value from the map at a later time. Thats why this would not be useful. — NUMBART
– NUMBART, Commented Jul 23, 2021 at 5:49
Ok, so a map with an object as the key isn't the appropriate tool - you'll need to use a different way to make the key, or different object altogether - if you're careful, you could use JSON.stringify({a:1}) as the key — Bravo
– Bravo, Commented Jul 23, 2021 at 5:51

HiEd · Accepted Answer · 2021-07-23 05:48:51Z

1

This works. Take a look at the official documentation.

let map1 = new Map();
let keyobj = {a: 1};
map1.set(keyobj, "valueforobject");
console.log(map1.get(keyobj));

answered Jul 23, 2021 at 5:48

HiEd

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