JavaScript Fable: F# |> Js
基于 F#，强类型函数语言。感觉不错，代码清晰易读。前端有福了。
体验一下：
type Face = Ace | King | Queen | Jack | Number of int
type Color = Spades | Hearts | Diamonds | Clubs
type Card = Face * Color
let aceOfHearts = Ace,Hearts
let tenOfSpades = (Number 10), Spades
match card with
| Ace, Hearts -> printfn "Ace Of Hearts!"
| _, Hearts -> printfn "A lovely heart"
| (Number 10), Spades -> printfn "10 of Spades"
| _, (Diamonds|Clubs) -> printfn "Diamonds or clubs"
// warning: Incomplete pattern matches on this expression.
// For example, the value '(_,Spades)' may indicate
// a case not covered by the pattern(s).
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