Javascript Algorithm Number Square Number calculate 1

function sqrtIntNaive(number){
    if(number == 0 || number == 1)
        return number;      

    var index = 1, square = 1;

    while(square < number){
        if (square == number){
            return square;
        }/*w  w  w. ja v  a2 s .  co m*/

        index++;
        square = index*index;
    }
    return index;
}
let a = sqrtIntNaive(9);
console.log(a);