[Haskell-cafe] GHC predictability

[Bryan O'Sullivan]

Darrin Thompson wrote:

> These "tricks" going into Real World Haskell?

Some will, yes.

For example, the natural and naive way to write Andrew's "mean" function
doesn't involve tuples at all: simply tail recurse with two accumulator
parameters, and compute the mean at the end.  GHC's strictness analyser
does the right thing with this, so there's no need for seq, $!, or the
like.  It's about 3 lines of code.

	<b