JSFiddle - React, Tailwind, and code Playground

JavaScript

function uniqueDigits(count){
            var number='',
                index=0,
                digit,
                minDigit=1;

            while (index < count && index < 10) {
               do{
                   digit=Math.floor(Math.random() * (10- minDigit)) + minDigit;
               }while(~number.indexOf(digit));
               minDigit=0;
               number+=digit;
               index++;
            }

            return number;
        }

        alert(uniqueDigits(90));