Question

I have recently been stuck on what I think should be a fairly simple problem.

Basically I have weekdays represented as a number (1-7) representing Monday to Sunday.

I need a function that has this prototype:

function weekday_between(weekday, start_weekday, end_weekday) {
    //if the weekday is between start and end then return true, otherwise return false
    ...
}

The main issue I am having is when the start_weekday is greater than the end_weekday, since I don’t think you can just rely on a nested if statement (?).

For example:

weekday_between(2, 1, 3) //return true
weekday_between(1, 7, 2) //return true, the hard part
weekday_between(2, 7, 1) //return false
weekday_between(6, 7, 1) //return false

The project is in php but pseudocode is fine, or even just a point in the right direction.

Answer 1

function weekday_between(weekday, start_weekday, end_weekday) {
    if (end_weekday < start_weekday)
        return (weekday > start_weekday) OR (weekday < end_weekday);
    else
        return (weekday > start_weekday) AND (weekday < end_weekday);
}