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

Posted by Daniel Statsenko
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Daniel Statsenko
Full Stack JavaScript Techdegree Student 4,235 Points

What if the low number is negative, like -3 for example?

What if the low number is negative, like -3 for example?

1 Answer

Cameron Childres
Cameron Childres
11,817 Points
Cameron Childres
Cameron Childres
11,817 Points

Hi Daniel,

Take a look at the conditional in the solution:

if (lowNumber >= 0 && highNumber) {
  const randomNumber = Math.floor( Math.random() * (highNumber - lowNumber + 1) ) + lowNumber;
  console.log(`${randomNumber} is a random number between ${lowNumber} and ${highNumber}.`);
} else {
  console.log('You need to provide two numbers. Try again.');
}

lowNumber is checked to be greater than or equal to 0. If it is a negative number this test fails, evaluates as false, and executes the else statement.

You might notice that there's no such test for highNumber. What would happen if you gave a lower value for highNumber than lowNumber, or if you gave highNumber a negative value? For instance lowNumber = 1 and highNumber = -3. I'd recommend trying this out in your workspace to see the result and brainstorming ways you could test for this.

Hope this helps! Let me know if you have any questions.