return true if not empty
return all elements separated by a comma
return the first element of a list or a default element of the same type
alias for mkString
return the list if not empty or another list
permute the elements of a list
return all the permuations of a list, including its sublists
return a new list where the element at position pos is replaced with another element
return all the permuations of a list
return a string with all elements toString values appended
Add utility methods to Lists