On Friday, 21 March 2014 at 12:29:31 UTC, bearophile wrote:
So before taking any decision on the matter, more experiments
and usage examples are necessary, where you have longer chains.
If you have a longer chain:
items
.sort()
.group
.map!(g => g[1] / double(s.length))
.map!(p => -p * p.log2)
.sum
.each(...);
using a each() allows you to keep a nice column. If you use
foreach your formatting and your logic has a hiccup, because
you are mixing two different styles:
foreach (item; items
.sort()
.group
.map!(g => g[1] / double(s.length))
.map!(p => -p * p.log2)
.sum) {
// Do something imperative here.
}
But this is not a real example (it computes the entropy of
items, and you usually don't need an each there), so more usage
examples are needed. Taking a look at real world usages of
foreach() in Scala could be useful.
The former example doesn't become functional just because you
managed to use UFCS, it's just imperative code deceptively
disguised as functional code. The clear separation in the latter
example is a *good thing*.
