notes.txt

this is a notes used to learn haskell following the wikiboks tutorial.

staring here:
1)forget everything learned in python , c++ or java as haskell is completely different.
2)GHC is a state-of-the-art, open source, compiler and interactive environment for the functional language Haskell. Highlights
3)first install ghc using(curl --proto '=https' --tlsv1.2 -sSf https://get-ghcup.haskell.org | sh)
4)haskell programs end with .hs file extension
5) creating haskell_1.hs
6)to run a program follow these steps:
    debian:/home/jdtang/haskell_tutorial/code# ghc -o hello_you --make listing2.hs
    debian:/home/jdtang/haskell_tutorial/code# ./hello_you Jonathan
    Hello, Jonathan

7)-o helps create a specifies the name of the executable you want to create, and then you just specify the name of the Haskell source file
8)completed First steps from the article
    *)module Main where
      import System.Environment

      include this the start of the program
    *)main :: IO()
    declaring main function
    *)do 
    starts the program
    *)args <- getArgs
    this get function like ex: function main(args)
    *)args <- getLine
    this reads the entire line ex: args = in.nextLine()
    *)there are two ways to output into the console
      1)putStrLn()
      2)print()
    *)to concatenate into the string use ++