I'm running a Perl Course this week ... a small group, so we can look at some very interesting constructs that I wouldn't normally cover / consider on a public course.

Comment out a block of code with an impossible condition

if (1 == 0) { ....

This is a great way to temporarily comment out a whole block of your code if you want to supress it for a while.

Toggle a variable between two values

$n = 3 - $n;

If $n was one before the statement, it becomes 2, and vice versa. The constant you use (3 in this case) is simply the sum of the two values you wish to toggle between.

Output an integer in binary

printf ("%b",$value);

sprintf and printf in Perl support the "b" formatter for binary - in addition to the more common "o" for Octal, "d" for decimal and "x" for hexadecimal.

All of these techniques together ...

# Some Perl Tricks
$n = 1;
if (1 == 0) {
  print "This is a comment";
  print "And so is this"; }
for ($k=1;$k<20;$k+=3) {
  $n = 3 - $n;
  printf ("%05b %2d %2d\n",$k,$n,$k); }

And when we run that:

grahamellis$ perl ppa
00001 2 1
00100 1 4
00111 2 7
01010 1 10
01101 2 13
10000 1 16
10011 2 19
grahamellis$
(written 2007-08-21)

 P202 - Perl Fundamentals
  [3574] Perl functions such as chop change their input parameters - (2012-01-10)
  [3542] What order are operations performed in, in a Perl expression? - (2011-12-07)
  [3398] Perl - making best use of the flexibility, but also using good coding standards - (2011-08-19)
  [3329] Perl from basics - (2011-06-20)
  [3278] Do I need to initialise variables - programming in C, C++, Perl, PHP, Python, Ruby or Java. - (2011-05-05)
  [3102] AND and OR operators - what is the difference between logical and bitwise varieties? - (2010-12-24)
  [3059] Object Orientation in an hour and other Perl Lectures - (2010-11-18)
  [2876] Different perl examples - some corners I rarely explore - (2010-07-18)
  [2832] Are you learning Perl? Some more examples for you! - (2010-06-27)
  [2442] Variable storage - Perl, Tcl and Python compared - (2009-10-08)
  [1946] Variable Types in Perl - (2008-12-15)
  [1826] Perl - Subs, Chop v Chomp, => v , - (2008-10-08)
  [1726] Hot Courses - Perl - (2008-07-28)
  [1448] Question on division (Java) - Also Perl, PHP, Python ... - (2007-11-28)
  [748] Getting rid of variables after you have finished with them - (2006-06-06)
  [184] MTBF of coffee machines - (2005-01-20)

P207 - Perl - File Handling
  [3548] Dark mornings, dog update, and Python and Lua courses before Christmas - (2011-12-10)
  [3326] Finding your big files in Perl - design considerations beyond the course environment - (2011-06-14)
  [2833] Fresh Perl Teaching Examples - part 2 of 3 - (2010-06-27)
  [2821] Chancellor George Osborne inspires Perl Program - (2010-06-22)
  [2818] File open and read in Perl - modernisation - (2010-06-19)
  [2405] But I am reading from a file - no need to prompt (Perl) - (2009-09-14)
  [2233] Transforming data in Perl using lists of lists and hashes of hashes - (2009-06-12)
  [1861] Reactive (dynamic) formatting in Perl - (2008-10-31)
  [1860] Seven new intermediate Perl examples - (2008-10-30)
  [1841] Formatting with a leading + / Lua and Perl - (2008-10-15)
  [1709] There is more that one way - Perl - (2008-07-14)
  [1467] stdout v stderr (Tcl, Perl, Shell) - (2007-12-10)
  [1442] Reading a file multiple times - file pointers - (2007-11-23)
  [1416] Good, steady, simple example - Perl file handling - (2007-10-30)
  [867] Being sure to be positive in Perl - (2006-09-15)
  [702] Iterators - expressions tha change each time you call them - (2006-04-27)
  [618] Perl - its up to YOU to check your file opened - (2006-02-23)
  [616] printf - a flawed but useful function - (2006-02-22)
  [255] STDIN, STDOUT, STDERR and DATA - Perl file handles - (2005-03-23)
  [114] Relative or absolute milkman - (2004-11-10)
  [12] How many people in a room? - (2004-08-12)

P207 - Perl - File Handling

Back to What do people look for on a hotel web site?

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Forward to Tratum Technologies

Filtering and altering Perl lists with grep and map
Two years of campaigning for a train service
Business travel by train in the USA
Tratum Technologies
Some one line Perl tips and techniques
What do people look for on a hotel web site?
Callbacks - a more complex code sandwich
Dates for Easter - 2008 to 2015
Good to be home
Troy, up state New York