Loop statements could be with a loop variable

[xp44mm]

If we redesign the f # language in the future, the loop statement should contain a loop variable, which is an integer, starting from 0, with a step size of 1. The semantics of the loop variable is to indicate the times of loops.

Only two loops are reserved, first is for in, another is while.

for in It uses similar to the curried interface of the iteri loop:

for i e in ['a'..'d'] do
    Console.Write(sprintf "%d" i)
//01234

loop while:

for i while i<5 do
    Console.Write(sprintf "%d" i)
//01234

An infinite loop with a loop variable, which is implemented by omitting the while clause of the while loop.

for i do
    dosomething i

They can still simplify the compatibility of corresponding statements without loop variables.

for e in ['a'..'d'] do
    Console.Write(sprintf "%A" e)

loop while:

while truly() do
    Console.Write("do something.")

[Xyncgas]

System.Linq or F# stanard library provides this function
it's shorter, mapi iteri etc or write your own function

[Xyncgas]

for i do
    dosomething i

Given i wasn't given a definition, An automatic increment of it, Yes it's too simple to be happening in F#