public static IGroup <Target> Transform <Source, Target>(this IGroup <Source> group1, Func <Source, Target> transfromFunction, Func <Target, Source> backWard)
{
var operationSet = new GroupSetOperation <Source>();
return(operationSet.Transform(group1, transfromFunction, backWard));
}
/// <summary>
/// Union both group in one
/// </summary>
public static IGroup <T> Union <T>(this IGroup <T> group1, IGroup <T> group2)
{
var operationSet = new GroupSetOperation <T>();
return(operationSet.Union(group1, group2));
}