JavaScript Function to get a Valid Number from String

Here is the function to get a numeric value from a string value.

    function GetValidNumberValue(inValue)

   {

        if (inValue == null) return 0.0;
        if (inValue == undefined) return 0.0;
        if (isNaN(inValue) == true) return 0.0;
        let togoNumber = parseFloat(inValue);
        if (isNaN(togoNumber) == true) return 0.0;
        return togoNumber;
    }