Learning Haskell Week02 - Intro To Functions

Learning Haskell for absolute beginners! This week we will be tackling how to create and use functions.

As always, accompanying slides will be hosted at

[limboski]

Well, the Haskelly extension button "Load GHCi" fails for me due to the "--ghci-options" command line option with the command: "stack ghci --ghci-options Lib.hs". I get the following error message:
<no location info>: error: can't find file: Lib.hs
Failed, no modules loaded.

The problem seems to be that even though "Load GHCi" tells powershell to change the directory to the "src" directory in the powershell (cd "j:\bobhaskell\bobtest\src), the "current working directory in Ghci shows it to be one level up in the project directory (J:\bobhaskell\bobtest ) when using "--ghci-options."

Any ideas on why Load GHCi is failing?

[JetsFan-ye]

Hey Curtis, when I type double x = x + x I don’t get the purple line above it I have all the extensions I don’t know why this is happening any help would be nice:)

[jesusmtz]

That where feature is so nice and clean

[HamzaKhan-hojw]

i followed you step by step but my vs code says Project requires GHC but it isn't installed. i installed it but it has this issue. also when i in new terminal tries stack it gives some error

[nitusah]

<interactive>:8:2: warning: [-Wtype-defaults]
* Defaulting the following constraints to type `Integer'
(Show a0) arising from a use of `print' at <interactive>:8:2-14
(Num a0) arising from a use of `it' at <interactive>:8:2-14
(Enum a0) arising from a use of `it' at <interactive>:8:2-14
* In a stmt of an interactive GHCi command: print it
6
*Lib> factorial 3

why this error is showing? Can anyone help me, please??

[jannik]

How can I add load GHCi to the status bar ?

[my_parents_mistake]

Does this tutorial need to be watched before the second live tutorial or first live tutorial on week 3

[andrewganssle]

Hey how do I open visual studios and get a completely new template. Every time I open it I am still in src/Lib.hs from the last video. Even when I hit new template it still has me in that file and everything? Probably a dumb question but this is my first programming ever. Also I'm really excited to go on this journey with you and cannot thank you enough for your time and efforts!

[davidbanigo]

Might seem like a silly comment but is there any way I can learn the different instructions for every function, because sometimes you start keying in something and I am so lost basically cause I have no previous knowledge on haskell language.

[viktorturchenko]

Hi, where are the exercises you mentioned in the end of the video?

[amrthabi]

Did you just recommend spaces over tabs???
Why would you say something so controversial yet so brave?