[nodejs] 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 ?
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[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 <https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map>

kai zhu

Post by 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 ?
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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.
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