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Iteration

L1

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Iteration1.pl
#!/usr/bin/env perl
use utf8;
use Utils;
use strict;
use warnings;

MAIN:
{
	my $max = 5;
	if (scalar(@ARGV) == 1) {
		$max = Utils::stoiWithDefault($ARGV[0], 5);
	}
	for (my $i = 0; $i < $max; ++$i) {
		print "Hello, world!\n";
	}
}
Output
$ perl Iteration1.pl 5 Hello, world! Hello, world! Hello, world! Hello, world! Hello, world!
Iteration2.pl
#!/usr/bin/env perl
use utf8;
use strict;
use warnings;

MAIN:
{
	for (my $i = 10; $i >= 1; --$i) {
		print $i, "\n";
	}
	print "Blastoff!\n";
}
Output
$ perl Iteration2.pl 10 9 8 7 6 5 4 3 2 1 Blastoff!
Iteration3.pl
#!/usr/bin/env perl
use utf8;
use strict;
use warnings;

MAIN:
{
	print "Even numbers up to 100...\n";
	for (my $i = 2; $i <= 100; $i += 2) {
		print $i, "\n";
	}
}
Output
$ perl Iteration3.pl Even numbers up to 100... 2 4 6 8 10 12 14 16 18 ... 82 84 86 88 90 92 94 96 98 100
Iteration4.pl
#!/usr/bin/env perl
use utf8;
use strict;
use warnings;

MAIN:
{
	print "Floating point numbers\n";
	for (my $d = 1.0; $d < 2.01; $d += 0.1) {
		print $d, "\n";
	}
}
Output
$ perl Iteration4.pl Floating point numbers 1 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2
Iteration5.pl
#!/usr/bin/env perl
use utf8;
use strict;
use warnings;

MAIN:
{
	print "Powers of 2 up to 256!\n";
	for (my $i = 1; $i <= 256; $i *= 2) {
		print $i, "\n";
	}
}
Output
$ perl Iteration5.pl Powers of 2 up to 256! 1 2 4 8 16 32 64 128 256
Iteration6.pl
#!/usr/bin/env perl
use utf8;
use strict;
use warnings;

MAIN:
{
	binmode(STDOUT, ":utf8");
	binmode(STDERR, ":utf8");
	binmode(STDIN, ":utf8");
	my $s = "Hello, world! 🥰🇺🇸";
	foreach my $c (split('', $s)) {
		print $c, "\n";
	}
}
Output
$ perl Iteration6.pl H e l l o , w o r l d ! 🥰 🇺 🇸

Iterators

perl

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