I’m dabbling in Haskell, and while I managed to do this, and it works fine, I have the Feeling that there must be something more idiomatic way to do this within the
do-notation withouth having to resort to the two
main = do n <- (liftM read (liftM head getArgs)) :: IO Int putStrLN . show $ sum [1..n]
If I do
main = do args <- getArgs arg1 <- head args n <- read arg1 :: IO Int putStrLn . Show $ sum [1..n]
Expected type: String Actual type: Char In the first Argument of 'read', namely 'arg1'
which I do not understand.
<- getArgs returns IO [String], so
<- head args should return
IO String, but it seems to return
IO Char?! (as per error message).
So my two questions are:
1) what is the most idiomatic way do do this 2) what’s wrong in the second version?
✓ Extra quality
ExtraProxies brings the best proxy quality for you with our private and reliable proxies
✓ Extra anonymity
Top level of anonymity and 100% safe proxies – this is what you get with every proxy package
✓ Extra speed
1,ooo mb/s proxy servers speed – we are way better than others – just enjoy our proxies!
USA proxy location
We offer premium quality USA private proxies – the most essential proxies you can ever want from USA
Our proxies have TOP level of anonymity + Elite quality, so you are always safe and secure with your proxies
Use your proxies as much as you want – we have no limits for data transfer and bandwidth, unlimited usage!
Superb fast proxy servers with 1,000 mb/s speed – sit back and enjoy your lightning fast private proxies!
99,9% servers uptime
Alive and working proxies all the time – we are taking care of our servers so you can use them without any problems
No usage restrictions
You have freedom to use your proxies with every software, browser or website you want without restrictions
Perfect for SEO
We are 100% friendly with all SEO tasks as well as internet marketing – feel the power with our proxies
Buy more proxies and get better price – we offer various proxy packages with great deals and discounts
We are working 24/7 to bring the best proxy experience for you – we are glad to help and assist you!