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→AUTHOR
== NAME ==
== NAME ==
perlintro -- a brief introduction and overview of Perl
perlintro -- a brief introduction and overview of Perl,if you are looking to found the complete edition of perl documentation, see http://perldoc.perl.org/index.html
you can find the source of this Tutorial http://perldoc.perl.org/perlintro.html
you can find the source of this Tutorial http://perldoc.perl.org/perlintro.html
== DESCRIPTION ==
== DESCRIPTION ==
$fruit_color{"apple"}; # gives "red"
$fruit_color{"apple"}; # gives "red"
You can get at lists of keys and values with '''keys()''' and '''values()'''.
You can get at lists of keys and values with '''[http://perldoc.perl.org/functions/keys.html keys()]''' and '''[http://perldoc.perl.org/functions/values.html values()]'''.
my @fruits = keys %fruit_colors;
my @fruits = keys %fruit_colors;
==== if ====
==== if ====
if ( condition ) {
[http://perldoc.perl.org/functions/if.html if] ( condition ) {
...
...
} elsif ( other condition ) {
} [http://perldoc.perl.org/functions/elsif.html elsif] ( other condition ) {
...
...
} else {
} [http://perldoc.perl.org/functions/else.html else] {
...
...
}
}
There's also a negated version of it:
There's also a negated version of it:
unless ( condition ) {
[http://perldoc.perl.org/functions/unless.html unless] ( condition ) {
...
...
}
}
==== while ====
==== while ====
while ( condition ) {
[http://perldoc.perl.org/functions/while.html while] ( condition ) {
...
...
}
}
There's also a negated version, for the same reason we have '''unless''' :
There's also a negated version, for the same reason we have '''unless''' :
until ( condition ) {
[http://perldoc.perl.org/functions/until.html until] ( condition ) {
...
...
}
}
Exactly like C:
Exactly like C:
for ($i = 0; $i <= $max; $i++) {
[http://perldoc.perl.org/functions/for.html for] ($i = 0; $i <= $max; $i++) {
...
...
}
}
The C style for loop is rarely needed in Perl since Perl provides the more friendly list scanning '''foreach''' loop.
==== foreach ====
==== foreach ====
foreach (@array) {
[http://perldoc.perl.org/functions/foreach.html foreach] (@array) {
print "This element is $_\n";
print "This element is $_\n";
}
}
}
}
The '''foreach''' keyword is actually a synonym for the for keyword. See [http://perldoc.perl.org/perlsyn.html#Foreach-Loops Foreach Loops in perlsyn].
For more detail on looping constructs (and some that weren't mentioned in this overview) see [http://perldoc.perl.org/perlsyn.html perlsyn].
For more detail on looping constructs (and some that weren't mentioned in this overview) see [http://perldoc.perl.org/perlsyn.html perlsyn].
=== Builtin operators and functions ===
=== Builtin operators and functions ===
Perl comes with a wide selection of builtin functions. Some of the ones we've already seen include '''print''', '''sort''' and '''reverse'''. A list of them is given at the start of perlfunc and you can easily read about any given function by using '''perldoc -f functionname'''.
Perl comes with a wide selection of builtin functions. Some of the ones we've already seen include '''[http://perldoc.perl.org/functions/print.html print]''', '''[http://perldoc.perl.org/functions/sort.html sort]''' and '''[http://perldoc.perl.org/functions/reverse.html reverse]'''. A list of them is given at the start of [http://perldoc.perl.org/perlfunc.html perlfunc] and you can easily read about any given function by using '''perldoc -f functionname'''.
Perl operators are documented in full in perlop, but here are a few of the most common ones:
Perl operators are documented in full in [http://perldoc.perl.org/perlop.html perlop], but here are a few of the most common ones:
==== Arithmetic ====
==== Arithmetic ====
# in $a
# in $a
The '''s///''' substitution operator is documented in [http://perldoc.perl.org/perlop.html perlop].
The '''[http://perldoc.perl.org/functions/s.html s///]''' substitution operator is documented in [http://perldoc.perl.org/perlop.html perlop].
==== More complex regular expressions ====
==== More complex regular expressions ====
Kirrily "Skud" Robert <skud@cpan.org>
Kirrily "Skud" Robert <skud@cpan.org>
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