Comparing F# with C#: A simple sum
https://swlaschin.gitbooks.io/fsharpforfunandprofit/content/posts/fvsc-sum-of-squares.html
F# 与 C# 的比较:一个简单的求和
// define the square function
let square x = x * x
// define the sumOfSquares function
let sumOfSquares n =
[1..n] |> List.map square |> List.sum
// try it
sumOfSquares 100更少的代码
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