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using if and ||


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I'm trying to use the js below to check whether lunch is inputted as 0.25, 0.5, 0.75 or 1.


Below is the code. It seams to be working as:  if ((day_object[dayname].lunch) != "0.25"){

but as  if (((((day_object[dayname].lunch) != "0.25") || (day_object[dayname].lunch) != "0.5") || (day_object[dayname].lunch) != "0.75") || (day_object[dayname].lunch) != "1") {

it pulls the alert whatever is inputted.


else if ((day_object[dayname].start_hhmm != "")  && (day_object[dayname].finish_hhmm != "") && (day_object[dayname].lunch != "")) {
            if (((((day_object[dayname].lunch) != "0.25") || (day_object[dayname].lunch) != "0.5") || (day_object[dayname].lunch) != "0.75") || (day_object[dayname].lunch) != "1") {
            alert("Check lunch hour 0.25 is 1/4 of an hour. 0.5 is 1/2 an hour. 0.75 is 3/4 of an hour. 1 is 1 hour");
                day_object[dayname] = new oDay(day_object[dayname].dayname, day_object[dayname].start_hhmm, day_object[dayname].finish_hhmm, 0);

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Because you need to use the && (logical AND) operator in that case, not OR. Think about the logic involved. The conditional will always return TRUE when using || because no matter what value you compare, it can only equal one of the values in the conditional.

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