CODEWITHSUNDEEP
f#
Abhi.Rohila
Abhi.Rohila

Reputation: 25

F# type mismatch

I am converting a program from Haskell to F#. Having trouble accessing the Haskell Library in .Net.

What is wrong with this declaration?

type Product = string


type Shopping = Product list

let p_tea = "Tea"
let p_sugar = "Sugar"
let p_coffee = "Coffee"
let p_biscuit = "Biscuit"
let p_milk = "Milk"
let p_soya = "Soya"

let shopping = [p_tea,p_sugar,p_coffee,p_biscuit,p_milk]

I get the following error.. Similar declaration works in Haskell.. !!

Type mismatch. Expecting a
    Shopping    
but given a
    (string * string * string * string * string) list

Upvotes: 0

Views: 219

Answers (2)

Mau
Mau

Reputation: 14468

F# uses commas to separate elements in a tuple, and semicolons to separate elements in a collection. You want:

let shopping = [p_tea; p_sugar; p_coffee; p_biscuit; p_milk]

Upvotes: 1

Ramon Snir
Ramon Snir

Reputation: 7560

In F# list (and array) items are separated by a semicolon. Tuples are separated by commas.

type Product = string

type Shopping = Product list

let p_tea = "Tea"
let p_sugar = "Sugar"
let p_coffee = "Coffee"
let p_biscuit = "Biscuit"
let p_milk = "Milk"
let p_soya = "Soya"

let shopping = [p_tea; p_sugar; p_coffee; p_biscuit; p_milk]

Upvotes: 0

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