[Haskell-cafe] Silly question

[Bayley, Alistair]

> From: Joel Reymont [mailto:joelr1 at gmail.com] 
> 
> I didn't know about "it" in ghci, thanks. Are there multiple levels  
> of it?
> 
> I wanted z "a" :: Maybe Int which I understand now.
> 
>      Thanks, Joel

What do you mean by multiple levels? "It" just stores the most recent
expression/value. If you type "print it" then the result of the print
becomes the most recent value e.g.

*Foo> "boo"
"boo"
*Foo> :t it
it :: [Char]
*Foo> print it
"boo"
*Foo> :t it
it :: ()
*Foo> print it
()
*Foo>


The docs probably explain it better:
http://www.haskell.org/ghc/docs/latest/html/users_guide/ch03s04.html#id31036
40

Alistair.
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