Question

At school we are busy making a Spotify application. I am currently making an application where I get images from LastFM, from the current artist now playing. I get three random images shown.I am now trying to make sure that the 3 random images can’t be the same.

This is what I have at the moment:

var randno       = Math.floor ( Math.random() * artistImages.length );
var randno2      = Math.floor ( Math.random() * artistImages.length );
var randno3      = Math.floor ( Math.random() * artistImages.length );

Now I want to make sure that they are not the same. Can anybody help me on how to do this?

Answer 1

Use a while loop:

var randno = Math.floor ( Math.random() * artistImages.length );    

var randno2 = Math.floor ( Math.random() * artistImages.length );
while (randno2==randno)
{
   randno2 = Math.floor ( Math.random() * artistImages.length );
}

var randno3 = Math.floor ( Math.random() * artistImages.length );
while (randno3==randno || randno3==randno2)
{
   randno3 = Math.floor ( Math.random() * artistImages.length );
}