Use 'let' in 'if' expression
- by demas
I need a function that works like this:
foo :: Integer -> Integer -> [Integer]
foo a b = do
let result = []
let Coord x y = boo a b
if x > 0
let result = result ++ [3]
if y > 0
let result = result ++ [5]
if x < a
let result = result ++ [7]
if y < b
let result = result ++ [9]
result
I can not use the guards because the result can have more then one element. But as I see I can not use 'let' in the 'if' expression:
all_possible_combinations.hs:41:14: parse error on input `let'
How can I check multiple expressions and add new elements in the list?
I search not only imperative solution, but the functional one.
