addMinDecimal.js

function addMinDecimal(n, minDecimal) {
  var numberArr = String(n).split(''),
    i,
    total = minDecimal - numberArr.length,
    zeros = '';
  if (total > 0) {
    for (i = 0; i < total; i = i + 1) {
      zeros = zeros + '0';
    }
  }
  return zeros + numberArr.join('');
}