Seedable Random Number Generator in Typescript

RNG.ts

export class RNG {
    private seed:number;

    constructor(seed:number) {
        this.seed = seed;
    }

    private next(min:number, max:number):number {
        max = max || 0;
        min = min || 0;

        this.seed = (this.seed * 9301 + 49297) % 233280;
        var rnd = this.seed / 233280;

        return min + rnd * (max - min);
    }

    // http://indiegamr.com/generate-repeatable-random-numbers-in-js/
    public nextInt(min:number, max:number):number {
        return Math.round(this.next(min, max));
    }

    public nextDouble():number {
        return this.next(0, 1);
    }

    public pick(collection:any[]):any {
        return collection[this.nextInt(0, collection.length - 1)];
    }
}

When changing to floor, you also have to change pick (remove the -1):

public pick(collection:any[]):any {
return collection[this.nextInt(0, collection.length)];
}

otherwhise the last element is never picked, because max is no longer inclusive.