[thesz]

Haskell allow you to express algorithms in a more error-proof way.

For really complex things the implementation in scripting language can introduce errors that are catchable in typed language.

So you code your complex things, it fails to perform to expectations (but somehow performs, not just stack dumps). Where the source of fault lies, in the complex idea itself or in the almost whole source code?

My rule of thumb is that I write in Tcl/Python/Bash something that is not longer than 200-300 lines.