javascript arrays: adding entries

Question

I'm not sure how I would do this in Javascript. I want to create an array that would contain any number of error messages from my form.

I read on websites that you define the key for that array when adding new entries.

// Javascript
var messages = new Array();
messages[0] = 'Message 1';

How can I add entries into my array using a similar method I normally do in PHP

// PHP    
$messages = array();
$messages[] = 'Message 1'; // automatically assigned key 0
$messages[] = 'Message 2'; // automatically assigned key 1

Is it possible to emulate that in Javascript? I don't want to have to define the number of entries in my array as it can vary.

Thanks for helping me out on this very basic js question. -Lyon

@Lyon: This is one of those questions that can be answered by googling their title and reading the first result. — Tomalak
– Tomalak, Commented Apr 17, 2010 at 9:27
@Tomalak: And the goal according to Joel is that the question on stackoverflow is that first result google returns and the best answer you can find on the web. — VolkerK
– VolkerK, Commented Apr 17, 2010 at 10:25
@Volker: Ahhhh, that's a lame excuse and you know it. Even if the first result and best possible answer would be a Stack Overflow page... when people are not googling for an answer before asking away happily that wouldn't make much of a difference, would it. Apart from that I don't think it's SO's misssion to re-create all the programming knowledge in the world (because it's not "real" when it is not on SO and reading the spec is lame, or what?). — Tomalak
– Tomalak, Commented Apr 17, 2010 at 12:04
@Tomalak: There certainly discussion about that on meta.stackoverflow.com e.g. meta.stackexchange.com/questions/4448/… — VolkerK
– VolkerK, Commented Apr 17, 2010 at 14:38
@Tomalak with all due respect, i did my fair share of googling and checking out javascript array resources. The fact that I was searching for an answer similar to php's solution probably led to me never encountering the .push() method. With SO, I am able to present what I know in PHP, and ask the SO community on how best to do the same in Javascript. Google won't tell me that. — Lyon
– Lyon, Commented Apr 19, 2010 at 5:31

Max Shawabkeh · Accepted Answer · 2010-04-17 09:23:44Z

3

var messages = new Array();
messages.push('Message 1');
messages.push('Message 2');

answered Apr 17, 2010 at 9:23

Max Shawabkeh

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2 Comments

Beat me to it by 7 seconds. ;) +1

For the definition in ecmascript 3rd edition see mozilla.org/js/language/E262-3.pdf @ "15.4.4.7 Array.prototype.push"

asymmetric · Accepted Answer · 2010-04-17 09:24:26Z

2

messages.push('Message n');

that should do the trick :)

reference here

answered Apr 17, 2010 at 9:24

asymmetric

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