Question

Define a nested list type in OCaml where a node is either an element, or a...

Define a nested list type in OCaml where a node is either an element, or a list of nodes. (That is, write the OCaml code for this new data type.) You may use the built-in data type list as part of your definition.

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Answer #1

Here is the OCaml code for defining the Node type which represents a node in a nested list:

type 'a node = Element of 'a | List of 'a node list;;

This works as follows:

  • We use the constructor "Element" for a single element node. ('a is a generic type in OCaml)
  • We use the "List" constructor for a list of nodes.

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