Function union

Computes an interval that has all the values that belong to both x and y, the difference with hull is that x and y must overlap to compute the union

Example

Interval.union(
  Interval(-1, 1),
  Interval(5, 7)
)  // throws error
Interval.union(
  Interval(-1, 1),
  Interval(1, 7)
)  // Interval(-1, 7)

Throws

When x and y don't overlap

Returns