Go - Slices - 2

• Slice is NOT comparable
  
• Standard library provide a way to compare 2 byte slices
  
• Reference type such as pointers and channels, the == test whether two entities refer to the same thing
• The only legal slice comparison is against nil
  
• Zero value of slice is nil. Capacity of nil slice is 0. Not nil slice capacity may be 0 as well. 
  
• Use built-in append function to add element to a slice
  It seems underlying array become another reference after slice capacity bigger than declared one
  
• Append element to slice to exceed capacity, what will happen? 
  => New slice will be generated