Random element from a map

[glantucan con golo lojo]

What's the best way to get a random element out of a map?

[Jason O'Neil]

var array = Lambda.array(myMap);
var key = Math.floor(Math.random()*array.length);
var item = array[ key ];

Or use my stupidly simple library, http://lib.haxe.org/p/random/

Random.fromIterable( myMap )

On 28/08/2013 9:17 PM, "glantucan con golo lojo" <glan...@gmail.com> wrote:

What's the best way to get a random element out of a map?

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[TopHattedCoder]

Smallest:

var arr = Lambda.array(map); // Convert the map values into an array
return arr[Std.random(arr.length)]; // Return a random element from the arrau

[glantucan con golo lojo]

Nice!

Thank you both.

Just curious, besides Math.random() retrieving a float between 0 an 1 and Std.random(max) an integer between 0 and max. Is there another difference? One more random than another perhaps ;) ?

[Juraj Kirchheim]

You can look through the different implementations. On most platforms
you will find Std.random is simply implemented on top of Math.random -
purely for convenience.

It seems that cpp is an exception:
https://github.com/HaxeFoundation/haxe/blob/development/std/cpp/_std/Std.hx#L49
Although it's still possible that they are using the same underlying generator.

Regards,
Juraj