Comments on: How to use javascript hashes (or hash-table)

By: WebGL Tutorial 6 – Eventos de teclado y filtros de textura · Experimentando en la web

Wed, 02 Nov 2011 22:56:58 +0000

[...] Bright Hub fue una buena ayuda sobre consejos de uso de los eventos de teclado, y este artículo de Javascript de Kata me ilustró sobre la utilización de diccionarios. Y como siempre, estoy profundamente agradecido a [...]

By: dsimard

dsimard — Fri, 12 Aug 2011 19:47:17 +0000

You could do this :

var hashPetName={dog:'rex',cat:'Mistigri'};
hashPetName["ferret"] = 'Rocky';

By: Mike

Mike — Fri, 12 Aug 2011 01:32:26 +0000

That's fine if you already know what you are adding, but it would seem to me to be a little kludgy using that format when dynamically adding values to a hash table, which is the most typical use case.

By: Bigjeff5

Bigjeff5 — Thu, 19 May 2011 03:16:49 +0000

Just an FYI, the name of the website is absent from the links in this post (which means they go nowhere).

By: Nehagiri

Nehagiri — Fri, 25 Jun 2010 15:29:15 +0000

very cooool!

By: Dan Dascalescu

Dan Dascalescu — Sat, 18 Jul 2009 13:25:51 +0000

@nightfly: you can filter out properties inherited through the prototype chain using the hasOwnProperty Object method.

By: Nightfly

Nightfly — Fri, 22 May 2009 22:14:01 +0000

Using objects as associative arrays have severe shortcomings in JS.
It’s ok and fast to use them when you just want to index into a set of data with a non-numeric key (string), but if you use libraries such as Prototype you can’t iterate over the keys because those libraries add stuff to Object()’s prototype, making them properties of any objects you create and thus polluting your hash tables.
You can use Prototype’s (to stay with that lib) Hash object (http://prototypejs.org/api/hash) to work around this, but it’s very slow compared to native objects.

By: web developer

web developer — Mon, 16 Feb 2009 14:52:37 +0000

this is not a best way to create hash in javascript

#var hashPetName = new Object();
#hashPetName["dog"] = “Rex”;
#hashPetName["cat"] = “Mistigri”;

use this instead
var hashPetName={dog:’rex’,cat:’Mistigri’};

By: John

John — Mon, 26 Jan 2009 19:42:55 +0000

Hello dude, Thanks a lot for this post. I really need this one in my project. Thank you once again……

By: Thomas

Thomas — Fri, 16 Jan 2009 17:31:36 +0000

Hi Dan,

thanks a lot.
It really helpt me to understand how objects work in JS.

And: “Only valid key types are number and String”.
That’s also fine with me

Cheers, Thomas