##Group
Group is a structure for managing groups in which a value can only be a member of one group, and adding it to any additional groups will combine those groups together. This package automatically handles the combining of groups.
Example:
grp := group.New()
grp.Add(1, 3, 5, 10)
grp.Add(11, 14)
grp.Add(20, 2)
grp.Add(3, 11, 8)
The above will produce the groups:
[0] 1, 3, 5, 8, 10, 11, 14
[1] 2, 20
Create a new group:
grp := group.New()
Add values to the group:
grp.Add(1, 2, 3, 4, etc.)
Find the group of any value:
id, exists := grp.Of(4)
Retrieve all groups:
allgroups := grp.Groups() // [][]int
Get the total number of active (excluding empty) groups:
numgroups := grp.Len()
Optimize the groups, which removes empty groups and speeds up Groups() & Of() functions. This does not change any of the group IDs.
grp.Optimize()