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Asked: 2026-06-04T04:00:57+00:00

var num = 10.00; if(!parseFloat(num)>=0) { alert(NaN); } else { alert(Number); } I want

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var num = "10.00";
if(!parseFloat(num)>=0)
{
    alert("NaN");
}
else
{
    alert("Number");
}

I want to check if a value is not a float number, but the above code always returns NaN, any ideas what I am doing wrong?

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1 Answer

  1. Editorial Team

    !parseFloat(num) is false so you are comparing false >= 0

    You could do this:

    if(! (parseFloat(num)>=0))

    But it would be more readable to do this:

    if(parseFloat(num) < 0)
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