slice!(...) public

Deletes the element(s) given by an index (optionally with a length) or by a range. Returns the deleted object, subarray, or nil if the index is out of range. Equivalent to:

   def slice!(*args)
     result = self[*args]
     self[*args] = nil

   a = [ "a", "b", "c" ]
   a.slice!(1)     #=> "b"
   a               #=> ["a", "c"]
   a.slice!(-1)    #=> "c"
   a               #=> ["a"]
   a.slice!(100)   #=> nil
   a               #=> ["a"]
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