Yet Another Monad Tutorial (part 2: >>= and return)

[mvanier]

In the previous article I gave the conceptual background necessary to understand what monads are. Now I'm going to get into more of the details.

Comments

[anonymous]

Spelling error.
"we'd write this (using Maybe as our example instnace):"

"putStrLn "unpacks" that line of text from the monadic value, prints it back to the terminal, "
Doesn't >>= unpacks the value

"what the >>= operator is doing is taking that string (called s here) and printing it."
Isn't putStrLn doing the printing?

-Lakshmi Narasimhan

Thanks!

[mvanier]

Good catch! I'll fix it momentarily.

good tutorial

[anonymous]

Thanks for this very comprehensive tutorial. I have absolutely no experience with Haskell, but have read something about Monads, which I did not understand (in "Beautiful Code", btw, a great book). Now it makes perfect sense.

I think the topic cannot be explained much better, assuming only some programming experience and the tiniest bit of understanding of functional programming.

Re: good tutorial

[mvanier]

Thank you very much!

Thanks

[anonymous]

Great article! Thanks you. Greetings from Poland

Re: Thanks

[mvanier]

You're welcome!