HashMap objects in javascript [duplicate]

Question

Possible Duplicate:
Loop through JavaScript object
Get array of object’s keys

Is there a way to use hashmaps in javascript. I found this page which shows one way of having hashmaps in javascript. Based on that I am storing the data as below:

var map = new Object();
map[myKey1] = myObj1;
map[myKey2] = myObj2;

function get(k) {
   return map[k];
}

But I want the keySet (all the keys) of the map object just like it is done in Java (map.keySet();).

Can anyone show me how can get all the keys present in this object?

Community · Accepted Answer · 2017-05-23 11:46:59Z

16

for (var key in map) {
  if (map.hasOwnProperty(key)) {
    alert(key + " -> " + map[key]);
  }
}

https://stackoverflow.com/a/684692/106261

actually this way is much better :

var keys = Object.keys(map);

edited May 23, 2017 at 11:46

CommunityBot

11 silver badge

answered Oct 16, 2012 at 9:48

NimChimpsky

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Comments

AlexR · Accepted Answer · 2012-10-16 09:49:31Z

-2

You can use for..in statement:

for (var key  in map) {
    return map[key];
}

answered Oct 16, 2012 at 9:49

AlexR

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2 Comments

Sirko Over a year ago

This will just return the first value and not the keyset.

le3th4x0rbot Over a year ago

This will also return things from the prototype, which is inconvenient when using this as a general purpose map.

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