Custom Random Class For Random Int and Random Item in Javascript

// My custom random random class for generating random integer number

// and randomly selecting item from list or array

// inspired by Python

class Random{
    constructor(list=null){
        this.list=list;
    }
    choice(){
        let num = Math.random()*this.list.length;
        return this.list[parseInt(num)];
    }
    randint(start,end){
        let new_length = end-start;
        let numInt = Math.random(start,end)*new_length;
        return parseInt(numInt);
    }
}

let greetings = ['Good Morning','Good Afternoon',"Good Night",'Good Bye',"Let  us meet"];

let random =  new Random(greetings);
var message ;
message = random.choice();

console.log(message);

console.log(random.randint(1,20))