checkIfInteger(string) {
  let errors = 0;
  string.split("").forEach(digit => {
    if (isNaN(digit)) errors++;
  });
  if (!errors) return true;
}
checkIfNumber(string) {
  let errors = 0;
  if (string.split('.').length === 2) {
    (string.split('.')[0]).split('').forEach(digit => {
      if (isNaN(digit)) errors++;
    });
    (string.split('.')[1]).split('').forEach(digit => {
      if (isNaN(digit)) errors++;
    });
    if (string.split('.')[1].length > 2 || string.split('.')[1].length < 1) errors++;
  } else {
    string.split("").forEach(digit => {
      if (isNaN(digit)) errors++;
    });
  }
  if (!errors) return true;
}