Question
** I Need help with the following questions on my F# Review with explanation please! :) ** 4) Which of the following statements about F#
** I Need help with the following questions on my F# Review with explanation please! :) **
4) Which of the following statements about F# lists is not true? Select one:
a) They are immutable.
b) Their built-in functions are polymorphic.
c) They can be of any length.
d) They can be heterogeneous.
5) Which of the following F# expressions evaluates to [1; 2; 3]? Select one:
a) 1::2::3::[]
b) 1@2@3@[]
c) [1; 2; 3]::[]
d) ((1::2)::3)::[]
6) How does F# interpret the expression List.map List.head foo @ baz? Select one:
a) (List.map List.head) (foo @ baz)
b) ((List.map List.head) foo) @ baz
c) List.map (List.head (foo @ baz))
d) (List.map (List.head foo)) @ baz
7) How does F# interpret the type int * bool -> string list? Select one:
a) (int * (bool -> string)) list
b) ((int * bool) -> string) list
c) int * (bool -> (string list))
d) (int * bool) -> (string list)
8) Let F# function foo be defined as follows:
let rec foo = function | (xs, []) -> xs | (xs, y::ys) -> foo (xs@[y], ys)
If foo is supposed to append its two list parameters, which of the following is true? Select one:
a) foo fails Step 1 of the Checklist for Programming with Recursion.
b) foo fails Step 2 of the Checklist for Programming with Recursion.
c) foo fails Step 3 of the Checklist for Programming with Recursion.
d) foo satisfies all three steps of the Checklist for Programming with Recursion.
9) Which of the following is the type that F# infers for (fun f -> f 17)? Select one:
a) ('a -> 'b) -> 'b
b) (int -> int) -> int
c) (int -> 'a) -> 'a
d) ('a -> 'a) -> 'a
10) Which of the following has type int -> int list? Select one:
a) (@) [5]
b) [fun x -> x+1]
c) fun x -> 5::x
d) fun x -> x::[5]
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