"Ramaswamy, Vivek"
Hello All~
I have been reading the book ?Haskell for real programmers? and am presently on chapter 03.
There was a small program demonstrated by the author on ?let?. The problem is that when I cut and paste authors code into eclipse, the program works fine, where as when I write my own copy of the program I am getting an error. I figured out that when I remove the function any one function lend or bend, the file compiles and runs fine.
My question is why does the Haskell compiler complains, in the case 2 functions with the same signature and logic, even though their names are different.
module Lending where
{-- snippet lend --}
lend amount balance = let reserve = 100
newBalance = balance - amount
in if balance < reserve
then Nothing
else Just newBalance
{-- /snippet lend --}
bend amount balance = let reserver = 100
newBalance=balance-amount
The problem is here ^^^^ each element in a let clause should be indented to the same level, that is let foo = bar baz = qux is legal. foo and baz are both defined. But let foo = bar baz = qux is not legal, the compiler thinks baz = qux is part of the statement `foo = bar`, like `foo = bar baz = qux`. Also let foo = bar baz = qux is not legal, since the compiler thinks the let clause is over and expects the keyword `in`
in if balance < reserver
then Nothing
else Just newBalance
Regards
-Vivek Ramaswamy-