SOURCE

function randArr(){
    let arr = [];
    let arrLength = 100;
    for(let i = 0; i< arrLength; i++){
        let rand = 0;
        let isSame = false;
        do{
            rand = parseInt(Math.random()*100000);
            isSame = false;
            let stringRand = rand.toString().split("")
            for(let j = 0; j < stringRand.length; j++){
                if(stringRand[j] == stringRand[j+1]){
                    isSame = true
                }
            }
        }
        while(isSame || rand < 10000)
        arr.push(rand)
        if(i == arrLength-1 && [...new Set(arr)].length<100){
            arrLength++;
        }
    }
    return arr
}
randArr()