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+1

please help, JavaScript question?

var num = prompt('Enter a number!'); if (num > 0) { alert('Your number is positive!') } else if (num < 0) { alert('Your number is negative') } else if (num == 0) { alert('The number is 0') } else if (num === '' || num === null) { alert('You didn\'t enter a number!') } else { alert('That is not a number!') }; The empty string isn't running in this case when I put num == 0 before the num === '' like I have here but the (num === null) is running.. When I press enter on the empty string, it says "The number is 0." It only runs when I put num == 0 after the num === ''. Does order really matter in this case?

9/5/2019 7:07:29 PM

Ashley J.

3 Answers

New Answer

+2

Maybe parseInt(num) == 0

0

Change code to num ===0 == check value with autoconvert (empty string equaves 0 if vavue converts to INT) === check type variables, after check value

0

When I changed it to num === 0 and typed in 0 in the prompt, it switched to "That is not a number!" Could it be the operator precedence maybe? the empty string works when I put the (num == 0) after the (num === '' || num === null)