058-find-nth-digit-of-a-number.js

// The function findDigit takes two numbers as input, num and nth. It outputs
// the nth digit of num (counting from right to left).

// #Note

// If num is negative, ignore its sign and treat it as a positive value. If
// nth is not positive, return -1. Keep in mind that 42 = 00042. This means
// that findDigit(42, 5) would return 0.

var findDigit = function(num, nth){
  if(nth <= 0) return -1
  num = String(Math.abs(num)).replace(/^0*/, "");
  return Number(num[num.length - nth]) || 0;
}