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JavaScript JavaScript Numbers The Math Object Random Number Challenge – Two Numbers Solution

Brendan Moran
Brendan Moran
14,052 Points
Posted by Brendan Moran
Brendan Moran
14,052 Points

Just for fun: Allowing negative integers and 0 for both numbers, testing for high > low

Something to allow the user to provide any integer they want, positive or negative, as long as the highNumber is greater than the lowNumber. It requires a crazy long conditional statement so that we aren't limited to just the positive integers and so that the program isn't stopped by the falsey zero input on either number. The test for the greater number needs to come first so that we don't get some weirdness in the results. The inverse could have been thrown in to the giant "success test" that follows, but that would have been harder to read, and I wanted to give more specific feedback to the user.

if (lowNumber >= highNumber) {

  alert('The second number you provide needs to be greater than the first number. Please try again!');
  location.reload();

}  else if (lowNumber && highNumber || lowNumber === 0 && highNumber || lowNumber && highNumber === 0) { 

  // Use Math.random() and the user's numbers to generate a random number
  const randomNum = Math.floor(Math.random() * (highNumber - lowNumber + 1)) + lowNumber;
  // Create a message displaying the random number
  alert(`${randomNum} is a random number between ${lowNumber} and ${highNumber}. Let's do it again!`);
  location.reload();  

} else {

  alert('It appears that one of the values you provided was not a number. You need to type in a number for both prompts. Please try again!');
  location.reload();

}