F#学习第一天

let emptyList = []
let oneItem = "one" ::[]
let twoItem = "one" :: "two" ::[]

let shortHand = ["apples" ; "orange"]

let twoLists = twoItem @ shortHand

let objList = [box 1 ; box 2.0 ; box "three"]

for x in objList do
printf "%A," x

let listOfList = [[1;2;3];[4;5;6];[7;8;9;10]]
let rec concatList list =
    if List.isEmpty list then
        []
    else
        let head = List.head list in
        let tail = List.tail list in
        head @ (concatList tail)

let resultList = concatList listOfList

printf "%A" resultList

for item in resultList do
printfn "%A" item

let (++!@) a b = a + b

let rec Fib num =
    match num with
    | 1 -> 1
    | 2 -> 1
    | num -> Fib (num - 1) ++!@ Fib (num - 2)

let resultFib = Fib 10

printfn "%i" resultFib

let test1= (function x -> function y -> x+y) 2 3
printfn "%i" test1