Unique Random Number Generator Javascript

Question

I'm trying to make a bingo game for fun. I've looked in a lot of places for a unique generator but I can't seem to find one. I've tried to make my own,but once it actually hits a number that's the same it does an infinite loop. I've tried a simple code that in theory should work but for some reason things pass through. What can I do!? ``` var bc = []; for (var i = 0; i < 5; i++) { var r = Math.floor(Math.random()*20+1) + 0; if(!(r in bc)){ bc.push(r); } else { i--; } } ____________________________________________ ____________________________________________ ____________________________________________ b1=0; b2=0; b3=0; b4=0; b5=0; var bc = [b1,b2,b3,b4,b5] var bnc = function(){ var n = Math.floor(Math.random() * 5+1)+0; var n2 = Math.floor(Math.random() * 5+1)+0; b1 = n; var a1 = true; var as = false; while(a1){ var c = n; if(c===b1||c===0 ||as!==false){ c = n2; as=true; } if(c===b1||c===0&&as===true){ c = n; as=false; } if(c!=b1){ b2 = c; a1 = false; a2 = true; } } }; bnc(); console.…

Accepted Answer

once it actually hits a number that's the same

It never should. Such algorithms take longer the longer they run. You should take a different approach:

Put all possible numbers into a pool. Once you draw a number, remove it from the pool. Just like it's done in real life.

```
var pool = [1, 2, 3, 4, 5];
var getNumber = function () {
    if (pool.length == 0) {
        throw "No numbers left";
    }
    var index = Math.floor(pool.length * Math.random());
    var drawn = pool.splice(index, 1);
    return drawn[0];
};
```

Unique Random Number Generator Javascript

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