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nikklg [1K]
3 years ago
14

1. If an F# function has type 'a -> 'b when 'a : comparison, which of the following is not a legal type for it? Select one:

Computers and Technology
1 answer:
Stella [2.4K]3 years ago
7 0

Answer:

B. string -> (int -> int)

Explanation:

We are going to perform comparison operations '->'. It is important to notice that the comparison operation gives us a bool value (True or False) and the comparison operation is legal if and only if the data types to be compared are the same.

Example:

int(4)->int(5) False

int(4)->int(4) True

int(4)->string(4) Error, data types don't match

For this reason:

  • A. Is legal because float -> float evaluates to True, True is a boolean value and bool -> bool is legal because both are the same data type.
  • B. Is illegal because int -> int evaluates to True, True is a boolean value and string is not a boolean (string -> bool).
  • C. Is legal because int is the same type than int.
  • D. Is legal because the list is the same type than list regardless it's content.

Note:

The operations inside parentheses are evaluated first.

List is a type by itself regardless of its content.

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