CODEWITHSUNDEEP
.netf#functional-programmingside-effects
implmentor
implmentor

Reputation: 1416

Making printfn/IO pure in F#

There doesn't seem to be much online on making sure functions remains pure in F#.

To create an example, is there any way to make printfn/IO pure in F#?

Upvotes: 1

Views: 1009

Answers (2)

Paolo Falabella
Paolo Falabella

Reputation: 25844

you can google for F# implementations of Haskell's IO monad. Here's a nice example.

Upvotes: 8

Yet Another Geek
Yet Another Geek

Reputation: 4289

Printing to the Console is per definition something that changes state (console state) and do have side-effects (like deleting some of the console buffer).

If you are using somekind of CodeContracts or the like you should consider writing out the function result somewhere else, or using an assertion (Contract.Assume or Contract.Assert(this is used for static assertions)) for easier confirmation that you code works.

Upvotes: 0

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