F# for in loop this looping construct is used to iterate over the matches of a pattern in an enumerable collection such as a range expression, sequence, list, array, or other constructs that supports enumeration.
Syntax of F# for in loop
for pattern in enumerable-expression do body-expression
Example
The following program illustrates the concept −
// 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
When you compile and execute the program, it yields the following output −
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
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