On Sun, 2010-10-03 at 09:59 -0400, bearophile wrote: [ . . . ] > Page 10, and in other pages I'd like a non-proportional font for the > code, because I find it a little more readable (even better if it's > colorized, there are online tools able to produce colorized HTML from > D1 code too).
I continue to be intrigued by people who believe that code, unlike text,
is more readable in a monospace font. Personally I think monospace
fonts make code unreadable, I always prefer proportional fonts for code.
Currently I use Ocean Sans MT.
Colourized though, I agree, makes things more readable -- as long as the
colourization theme matches the semantics of the code fragment,
obviously.
[ . . . ]
> Page 20: is that functional? It even contains a mutable "sum" value.
> It may be seen as kind-of-functional. A more functional style is to
> use a reduce (fold) there, from std.algorithm.
I agree this is a weird sort of an example of "functional".
sum_of_squares as a function has no external side-effects (though
clearly the iteration has a side effect internally) and is referentially
transparent. So as a thing that can be used as a "functional
programming" function it is fine, its implementation is though very much
imperative programming -- at its worst ;-)
Given an imperative language with no tail recursion capability then one
has to declare a non-functional floor even when doing functional style
programming. In effect the execution graph has to be allowed to have
leaqf nodes that are implemented imperatively.
Coming from a Pythonic realization of these ideas, list comprehensions
seems to be the best way out of this sort of thing, so instead of:
def sumOfSquares ( sequence ) :
sum = 0.0
for item in sequence :
sum += item * item
return sum
it is better to write:
def sumOfSquares ( sequence ) :
return sum ( [ item * item for item in sequence ] )
So the question is whether there is an idiomatic D version of this.
[ . . . ]
--
Russel.
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Dr Russel Winder t: +44 20 7585 2200 voip: sip:russel.win...@ekiga.net
41 Buckmaster Road m: +44 7770 465 077 xmpp: rus...@russel.org.uk
London SW11 1EN, UK w: www.russel.org.uk skype: russel_winder
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