if statement - F#: if-else as an expression (returning values)? -

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Suppose i am trying to write a clone of xxd command in f code in it There are two operation modes; To convert a binary file to hex dump, and another (selected by -r ) to convert the hex dump to a binary file.

Some languages ​​allow me to write something like this: 

  let's (input file, hr passage) = if args [0] == "-R" then (args. [1], true) and (args. [0], false) ... if wrong == then proceed to the headline input file and reverse mode input file

but it does not seem compiled under F #, are there any idiomatic ways to write in F #? I'm not a big fan of riff or unstable , though I know that I will be able to write something like this with him: 

  Let's reverse = ref false false filename = RF args. [0] If! Args. [0] == "-R" is then Arvar: = true filename: = Args. [1] ... if false ==! Then the mood ahead! Input file and reverse modes! Input File

Note: I am not interested in good command line parser libraries, that I newsletter .

it should be fine F # 

  let's (inputfile, harvre ) = If args. [0] = "-r" then (args. [1], true) Other (args. [0], false) ... If false = increase the forward input file and reverse mode input file

two changes: if indent and == to =

Replace with

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