Explain how to create a custom Compare for can-set algebra

E.g. we want a list of items which date is less or equal to a given one:

model.getList( { date: { "$lte": someDate } } );

new set.Algebra(
    set.comparators.id("_id"),
    {
        date: function(a, b, aParent, bParent, ... ){
            // a === { "$lte": someDate }
            // b === undefined
            // aParent === { date: { "$lte": someDate } }
            // bParent === {}

            return ...;
        }
    }

bitovi / training

Explain how to create a custom Compare for can-set algebra #9