Check Nums code challenge

/**
 *           
This challenge requires you to return the string "true" if the second integer parameter (num2) is larger than the first (num1). This is actually a very simple challenge which doesn't require a lot of code.
 */

function CheckNums(num1, num2) {
  if (num2 > num1) {
    return true;
  }
  return false;
}

/* 1 */
function CheckNums(num1, num2) {
  if (num1 == num2) {
    return "-1";
  } else {
    return num2 > num1;
  }
}

/* 2 */
function CheckNums(num1, num2) {
  // code goes here
  if (num1 - num2 < 0) return true;
  else if (num1 - num2 > 0) return false;
  else return -1;
}

/* 3 */
function CheckNums(num1, num2) {
  if (num2 > num1) {
    return "true";
  } else if (num2 === num1) {
    return "-1";
  } else {
    return "false";
  }
}

/* 4 */
function CheckNums(num1, num2) {
  if (num1 === num2) {
    return -1;
  }
  if (num1 > num2) {
    return false;
  } else {
    return true;
  }
}
/* 5 */
function CheckNums(num1, num2) {
  if (num1 - num2 < 0) {
    return "true";
  } else if (num1 == num2) {
    return "-1";
  } else {
    return "false";
  }
}