Question

I am a complete novice at Javascript and having tried every possible combination of Boolean expressions I am left with the following code. Why does the following JS boolean logic fail for everything other than where effectiveDateSelected = true and throughDateSelected = false

            // initialisation  
            var effectiveDateSelected = new Boolean(false);
        var throughDateSelected = new Boolean(false);  

            // values read in from web page
            effectiveDateSelected = ...          
            throughDateSelected = ...

            // the logical expression 
        if ((effectiveDateSelected) && !(throughDateSelected)) {
            reportNum = 1;
            alert("1 reportNum=" + reportNum);
        }

        if (!(effectedDateSelected)  && (throughDateSelected)) { 
                            reportNum = 2;
            alert("2 reportNum=" + reportNum);
        }

        if (((effectedDateSelected)  && (throughDateSelected)) || 
            (!(effectedDateSelected)  && !(throughDateSelected))) {
            reportNum = 3;
            alert("3 reportNum=" + reportNum);
        }  

Answer 1

new Boolean() is always truthy as it’s an object, you want to use boolean primitives like false and true directly.

var condition = false;

You can see this when converting a boolean object to primitive:

Boolean( new Boolean( false ) ) //true