method
    
    group
 
  group()
  public
  Returns the ThreadGroup which contains thr, or nil if the thread is not a member of any group.
Thread.main.group #=> #<ThreadGroup:0x4029d914>
 
  group()
  public
  Returns the ThreadGroup which contains thr, or nil if the thread is not a member of any group.
Thread.main.group #=> #<ThreadGroup:0x4029d914>