HashMap objects in javascript

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?

score 16 · Accepted Answer · edited May 23 '17 at 11:46

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 '17 at 11:46

Community

1
1

answered Oct 16 '12 at 09:48

NimChimpsky

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score -2 · Answer 2 · answered Oct 16 '12 at 09:49

-2

You can use for..in statement:

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

answered Oct 16 '12 at 09:49

AlexR

114,158
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2

This will just return the first value and not the keyset. – Sirko Oct 16 '12 at 09:50
This will also return things from the prototype, which is inconvenient when using this as a general purpose map. – le3th4x0rbot Feb 27 '17 at 21:16

HashMap objects in javascript

2 Answers2

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