[pluies_public]

> Because nobody ever makes typos while using folds and closures, right?

If you type flod instead of fold, the compiler will complain. If you have an off-by-one error in your for loop, not so much.

[reinhardt]

If you type foldr instead of foldl it won't complain.

[tikhonj]

In most cases it will because they have different types:

    foldl :: (a -> b -> a) -> a -> [b] -> a
    foldr :: (a -> b -> b) -> b -> [a] -> b

So the only time it will be the same is if a and b are the same type.

[jlarocco]

> So the only time it will be the same is if a and b are the same type.

Which they will be in most of the example code he used. They're not the best examples.