delete(p1) public

Deletes items from self that are equal to obj. If the item is not found, returns nil. If the optional code block is given, returns the result of block if the item is not found. 

   a = [ "a", "b", "b", "b", "c" ]
   a.delete("b")                   #=> "b"
   a                               #=> ["a", "c"]
   a.delete("z")                   #=> nil
   a.delete("z") { "not found" }   #=> "not found"
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