reddit.com: first Chapter of TDPL available for free

[Andrei Alexandrescu]

Sam Hu wrote:
> Sorry for my stepping in,but as a beginner in D ,I think maybe you( all of you experts) have interest to hear what he think after he read the book:This is really really great!Thank you so much for your great job!

Thanks, Sam. I saved your comments and will modify the book accordingly. 
To get you going:

> Here a couple of questions regarding first chapter:
> 1.foreach (line; stdin.byLine) {
>   Did not mention how to read data from file  *hamlet.txt* to the analyse.If I want to run the test case,I don't know how.

You'd need to input it in the command line with "<", e.g. progname < 
hamlet.txt.

> 2. foreach (word; splitter(strip(line))) {
>      2.1 what's the purpose of splitter(strip(line)) ,I can guess a bit but not sure;
>   2.2 In the first place you used split,after that you use splitter;

split() splits a string by whitespace in one operation. splitter() does 
the same, but lazily - one at a time, as you go through the foreach 
loop. The advantage of the latter is that it does not require temporary 
storage.

> 3.string[] words = array(freqs.keys);
>   what's array? I can not find it from phobos,was I missing something?If yes,please forgive me.

It's in std.array (added fairly recently).

> 4.sort!((a, b) { return freqs[a] > freqs[b]; })(words);
>  cann't get compiled under dmd 2.031.

Walter!!!

This has worked on and off like forever. One day I'll break into 
Walter's house and etch that code onto his LCD monitor.

> 5.abstract class IncrementalStat : Stat {...}
>   Why need this extra abstract class which derived from interface Stat?For class Max,Min and AVG,does't it  work fine just implementing the Stat?For a beginner,it confused me a lot.I think it would be much better to explain more here. 

Will do.

> At the very begining,I am typing while reading to test all the impressive examples,but very quicky I found I am lost starting at the point of my qestion#1-4.So finally I gave up to test the example,just read.This is my experience.
> 
> Thank you again and best regards,
> Sam

Thanks, Sam.


Andrei