🍔Quiz

Question 1 - ⏱ 10’’

type Address = { City: string; Country: string }

let format address = $"{address.City}, {address.Country}"

let addresses: Address list = ...

What function should you use to apply the format function to addresses?

A. List.iter()

B. List.map()

C. List.sum()

Answer

A. List.iter() ❌

B. List.map() ✅

C. List.sum() ❌

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Question 2 - ⏱ 10’’

Que vaut [1..4] |> List.head ?

A. [2; 3; 4]

B. 1

C. 4

Answer

A. [2; 3; 4] ❌ (This is the result of List.tail)

B. 1 ✅

C. 4 ❌ (This is the result of List.last)

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Question 3 - ⏱ 10’’

Quelle est la bonne manière d'obtenir la moyenne d'une liste ?

A. [2; 4] |> List.average

B. [2; 4] |> List.avg

C. [2.0; 4.0] |> List.average

Answer

A. [2; 4] |> List.average ❌

💥 Error FS0001: List.average does not support the type int, because the latter lacks the required (real or built-in) member DivideByInt

B. [2; 4] |> List.avg

💥 Error FS0039: The value, constructor, namespace or type avg is not defined.

C. [2.0; 4.0] |> List.average ✅