Custom class object as Key in a Map

[Jay Sharma]

Hello All, 

I am new to nodejs/js, I have some query regarding the implementation of Map [Key-Value pair]

Like in java Maps, we can have custom object as key. 

Class Test {
   int i;
}




public static void main(String args[]) {
   Test obj = new Test();
   Map<Test, String> map= new HashMap<Test, String>();
   map.put(obj, "TestString");
}

Can we have similar thing in JS ?

[kai zhu]

hi Jay, javascript already has the Map class [1], illustrated with the following example code.

```js

/*jslint*/

"use strict";

var Test;

var map;

var obj;

Test = function () {

    return;

};

map = new Map();

obj = new Test();

map.set(obj, "TestString");

// Map { Test {} => 'TestString' }

```

[1] Map - JavaScript | MDN

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map

kai zhu

kaiz...@gmail.com

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[Zlatko]

Yes, in pretty much the same way: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map

There's more on that link, like Setc and WeakMap, so check them out, see what works best for your use case.