difference

function

`algebra.difference(a, b)`

Returns a set that represents the difference of sets A and B (A \ B), or returns if a difference exists.

algebra1 = new set.Algebra(set.props.boolean("completed"));
algebra2 = new set.Algebra();

// A has all of B
algebra1.difference( {} , {completed: true} ) //-> {completed: false}

// A has all of B, but we can't figure out how to create a set object
algebra2.difference( {} , {completed: true} ) //-> true

// A is totally inside B
algebra2.difference( {completed: true}, {} )  //-> false

Parameters

a {Set}:
A set.
b {Set}:
A set.

Returns

{Set|Boolean}:

If an object is returned, it is difference of sets A and B (A \ B).

If true is returned, that means that B is a subset of A, but no set object can be returned that represents that set.

If false is returned, that means there is no difference or the sets are not comparable.