F# - for...in 迴圈

此迴圈結構用於迭代可列舉集合（如範圍表示式、序列、列表、陣列或支援列舉的其他結構）中模式的匹配項。

語法

for pattern in enumerable-expression do
   body-expression

示例

以下程式演示了該概念 −

// Looping over a list.
let list1 = [ 10; 25; 34; 45; 78 ]
for i in list1 do
   printfn "%d" i

// Looping over a sequence.
let seq1 = seq { for i in 1 .. 10 -> (i, i*i) }
for (a, asqr) in seq1 do
   printfn "%d squared is %d" a asqr

在編譯和執行程式後，它會產生以下輸出 −

10
25
34
45
78
1 squared is 1
2 squared is 4
3 squared is 9
4 squared is 16
5 squared is 25
6 squared is 36
7 squared is 49
8 squared is 64
9 squared is 81
10 squared is 100