CODEWITHSUNDEEP
arraysactionscript-3objectrandomelement
Elonoa
Elonoa

Reputation: 467

How to get a random element from an object in AS3?

You can get a random element from an array like below

var list:Array=[1,2,3,4,5];
var randomElement:int = list[ int(Math.random()*list.length) ] ;

But how to get a random element from an object?

var list:Object={a:0,b:1,c:1};
var randomElement:int = //from the list..how??

Thanks

Upvotes: 0

Views: 865

Answers (3)

greentec
greentec

Reputation: 2280

What about this approach?

var list:Object = {a:0,b:1,c:1};
var keyCount:int = 3; //number of keys
var randomElement:String;

var randProb:Number = 1.0 / keyCount;

for (randomElement in list)
{
    if (Math.random() < randProb)
    {
        break;
    }
    else
    {
        randProb += 1.0 / keyCount;
    }
}

trace(list[randomElement]);

Upvotes: 0

Ivan Chernykh
Ivan Chernykh

Reputation: 42166

One more alternative ( for this special case ):

 var list:Object={ a:0,b:1,c:2 };
 var max_i:Number = "c".charCodeAt( 0 );
 var min_i:Number = "a".charCodeAt( 0 );
 var range:Number = max_i - min_i ;
 var rand_i:Number = Math.floor( Math.random() * ( range + 1 ) );

 var prop:String = String.fromCharCode( min_i + rand_i );
 var randomElement:int = list[ prop ];

 trace( prop , randomElement );

Upvotes: 1

fsbmain
fsbmain

Reputation: 5267

You can create temporary array of keys for example:

    var list:Object={a:0,b:1,c:2};
    var keys:Array = [];
    for(var key:String in list)
        keys[keys.length] = key;

    var randomElement:int = list[keys[ int(Math.random()*keys.length) ]];

It's quite expensive to create new array each time you need a random property of an object, but I don't see other options to get it.

Upvotes: 2

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